Michael O'Sullivan (politician)
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Michael O'Sullivan (May 4, 1784 â€“ March 7, 1839) was a lawyer, militia officer, politician and judge in
Lower Canada The Province of Lower Canada () was a British colonization of the Americas, British colony on the lower Saint Lawrence River and the shores of the Gulf of Saint Lawrence established in 1791 and abolished in 1841. It covered the southern portion o ...
. Born in
Clonmel Clonmel () is the county town and largest settlement of County Tipperary, Republic of Ireland, Ireland. The town is noted in Irish history for its resistance to the Cromwellian conquest of Ireland, Cromwellian army which sacked the towns of Dro ...
, Ireland, he emigrated to Lower Canada as a child and was educated at the Collège Saint-Raphaël, where he began a life-long association with the
Roman Catholic The Catholic Church (), also known as the Roman Catholic Church, is the largest Christian church, with 1.27 to 1.41 billion baptized Catholics worldwide as of 2025. It is among the world's oldest and largest international institut ...
Sulpician order The Society of Priests of Saint-Sulpice (; PSS), also known as the Sulpicians, is a society of apostolic life of Pontifical Right for men, named after the Church of Saint-Sulpice, Paris, where it was founded. The members of the Society add t ...
. He became a prominent member of the bar of Lower Canada, as well as a member of the
Legislative Assembly of Lower Canada The Legislative Assembly of Lower Canada was the lower house of the bicameral structure of provincial government in Lower Canada until 1838. The legislative assembly was created by the Constitutional Act of 1791. The lower house consisted of e ...
and Solicitor-general for Lower Canada. O'Sullivan was an officer in the Lower Canada militia during the
War of 1812 The War of 1812 was fought by the United States and its allies against the United Kingdom of Great Britain and Ireland, United Kingdom and its allies in North America. It began when the United States United States declaration of war on the Uni ...
. He participated in the
Battle of the Châteauguay The Battle of the Chateauguay was an engagement of the War of 1812. On 26 October 1813, a combined United Kingdom of Great Britain and Ireland, British and British North America, Canadian force consisting of 1,530 regulars, volunteers, militia ...
as aide-de-camp to Lieutenant-Colonel
Charles de Salaberry Lieutenant-Colonel Charles-Michel d'Irumberry de Salaberry, CB (19 November 1778 – 27 February 1829) was a Canadian military officer and politician who served in the French Revolutionary and Napoleonic Wars and War of 1812. He is best kno ...
, the commander of the Canadian and
Mohawk Mohawk may refer to: Related to Native Americans *Mohawk people (Kanien’kehá:ka), an indigenous people of North America (Canada and New York) *Mohawk language (Kanien’kéha), the language spoken by the Mohawk people *Mohawk hairstyle, from a ...
forces who were defending Lower Canada from an invading American force. O'Sullivan was
mentioned in dispatches To be mentioned in dispatches (or despatches) describes a member of the armed forces whose name appears in an official report written by a superior officer and sent to the high command, in which their gallant or meritorious action in the face of t ...
for bravery after the battle, and subsequently wrote a contemporary account of the battle which has become the basis for understanding the battle. O’Sullivan was elected to the Legislative Assembly of Lower Canada in 1814 and remained in office until 1824. He generally supported the ''
Parti canadien The () or () was a primarily francophone political party in what is now Quebec founded by members of the liberal elite of Lower Canada at the beginning of the 19th century. Its members were made up of liberal professionals and small-scale ...
'', but gradually moved away from it as it became more nationalist. During his time as a member of the Legislative Assembly, O'Sullivan was vocal in his opposition to building a new, non-denominational, hospital in Montreal; his outspokenness on the matter culminated in his fighting a
duel A duel is an arranged engagement in combat between two people with matched weapons. During the 17th and 18th centuries (and earlier), duels were mostly single combats fought with swords (the rapier and later the small sword), but beginning in ...
with a Montreal doctor, William Caldwell, who supported the proposal. The
hospital A hospital is a healthcare institution providing patient treatment with specialized Medical Science, health science and auxiliary healthcare staff and medical equipment. The best-known type of hospital is the general hospital, which typically ...
was ultimately built. In November 1838, O'Sullivan was appointed the Chief Justice of the Court of Queen's Bench in Montreal, but died in March 1839 at the age of 54.


Family and early life

O'Sullivan was born in
Clonmel Clonmel () is the county town and largest settlement of County Tipperary, Republic of Ireland, Ireland. The town is noted in Irish history for its resistance to the Cromwellian conquest of Ireland, Cromwellian army which sacked the towns of Dro ...
, Ireland, to John O'Sullivan and Eleonora O'Donel, who were related to prominent figures in
County Tipperary County Tipperary () is a Counties of Ireland, county in Republic of Ireland, Ireland. It is in the Provinces of Ireland, province of Munster and the Southern Region, Ireland, Southern Region. The county is named after the town of Tipperary (tow ...
. He emigrated to Lower Canada as a child, and was enrolled in the Collège Saint-Raphaël in Montreal from 1799 to 1806. The Collège was run by the
Sulpician order The Society of Priests of Saint-Sulpice (; PSS), also known as the Sulpicians, is a society of apostolic life of Pontifical Right for men, named after the Church of Saint-Sulpice, Paris, where it was founded. The members of the Society add t ...
, and his attendance began a life-long connection with the Sulpicians. He was recognised as a gifted student and finished at the top of his class. Other students in the class also went on to play leading roles in the nationalist politics of Lower Canada, such as
Hugues Heney Hugues Heney (September 9, 1789 – January 13, 1844) was a lawyer and political figure in Lower Canada. He was born in Montreal in 1789, the grandson of Pierre Foretier, and studied at the Collège Saint-Raphaël. Heney articled with Jos ...
,
André Jobin André Jobin (August 8, 1786 – October 11, 1853) was a civil law notary, notary and political figure in Lower Canada and Canada East. Family and early life Jobin was born in 1786 in Montreal, in the old Province of Quebec (1763–1791) ...
, and
Jean-Moïse Raymond Jean-Moïse Raymond (January 5, 1787 – February 8, 1843) was a businessman, militia officer and political figure in Lower Canada, and briefly in Canada East (now Quebec), in the Province of Canada. He was active in a family business inh ...
."Michael O'Sullivan, O'Sullivan was married twice. His first marriage, on June 1, 1809, was to Cécile Berthelet, daughter of the prosperous merchant and real estate owner,
Pierre Berthelet Pierre Berthelet (15 April 1746 - 2 January 1830) was a merchant in the Montreal area. He was also heavily involved in real estate. Berthelet probably began his first successful business ventures in the fur trade. Records show that he was successf ...
, and his wife Marguerite Viger. One brother-in-law from his first marriage,
Antoine-Olivier Berthelet Antoine-Olivier Berthelet (May 25, 1798 – September 25, 1872) was a businessman, philanthropist and political figure in Lower Canada. He was born in Montreal in 1798, the son of Pierre Berthelet, and studied at the Petit Séminaire de Mon ...
, was briefly a member of the Legislative Assembly, from 1832 to 1834. Another brother-in-law,
René-Joseph Kimber René-Joseph Kimber (November 26, 1786 – December 22, 1843) was a physician and political figure in Lower Canada and Canada East, in the Province of Canada (now Quebec). He represented Trois-Rivières in the Legislative Assembly of Lowe ...
, was also a member of the Legislative Assembly. However, that marriage was short, ending with Cécile's death in 1811. He did not marry again for twenty years, until his second marriage to Jeanne-Marie-Catherine Bruyères, a widow, on May 17, 1831. Both marriages linked O'Sullivan to well-established members of the French-speaking community in Montreal.


Militia service: Battle of the Châteauguay

During the
War of 1812 The War of 1812 was fought by the United States and its allies against the United Kingdom of Great Britain and Ireland, United Kingdom and its allies in North America. It began when the United States United States declaration of war on the Uni ...
, O'Sullivan participated in the
Battle of the Châteauguay The Battle of the Chateauguay was an engagement of the War of 1812. On 26 October 1813, a combined United Kingdom of Great Britain and Ireland, British and British North America, Canadian force consisting of 1,530 regulars, volunteers, militia ...
, which saved Montreal from an invading American force. The battle took place at the junction of the
Châteauguay River The Châteauguay River (or Chateaugay River in the United States) is a tributary of the South Shore of the St. Lawrence River, flowing in: * Clinton County, New York, Clinton County and Franklin County, New York, Franklin County, in the Adironda ...
and the English River. The Canadian regular and militia units and
Mohawk Mohawk may refer to: Related to Native Americans *Mohawk people (Kanien’kehá:ka), an indigenous people of North America (Canada and New York) *Mohawk language (Kanien’kéha), the language spoken by the Mohawk people *Mohawk hairstyle, from a ...
warriors were under the command of Lieutenant Colonel de Salaberry. They were outnumbered, but de Salaberry built up defensive positions with his forces protected by the dense woods, and trees and brushwood which they cut down. In a short battle, the Americans gave way and retreated, preserving Montreal from capture. The outcome of the battle had great strategic significance, since the capture of Montreal would have cut off
Upper Canada The Province of Upper Canada () was a Province, part of The Canadas, British Canada established in 1791 by the Kingdom of Great Britain, to govern the central third of the lands in British North America, formerly part of the Province of Queb ...
from supply and communications with Lower Canada and Great Britain. O'Sullivan was a lieutenant in a Beauharnois battalion of the Lower Canada militia, and served as aide-de-camp to de Salaberry. The Beauharnois battalions were heavily engaged in the battle. De Salaberry mentioned him in dispatches following the battle, praising O'Sullivan's bravery. After the battle, a dispute arose about the role played by the Governor General, Sir
George Prevost Sir George Prevost, 1st Baronet (19 May 1767 – 5 January 1816) was a British Army officer and colonial administrator who is most well known as the "Defender of Canada" during the War of 1812. Born in New Jersey, the eldest son of Genevan ...
, and Major-General
Louis de Watteville Louis de Watteville (born Abraham Ludwig Karl von Wattenwyl; 1 July 1776 – 16 June 1836) was a Swiss mercenary in Dutch and British service. He became a major general in the British Army, and fought in the Napoleonic Wars and the War of 1812. ...
. Neither Prevost nor de Watteville had been present at the battle, but stories began to spread that the victory was due to their leadership. Lieutenant Colonel George Macdonell, who had been in command of the reserve at Châteauguay, also began to claim credit. In response, a pseudonymous letter appeared in the ''Montreal Gazette'' on November 9, 1813, written by a ''"témoin oculaire"'' ("eye-witness"), confirming the impressive role and command decisions played by de Salaberry, and asserting that the victory was due entirely to the Canadians. Subsequent research has indicated that the ''témoin oculaire'' was O'Sullivan. Some years later,
Étienne-Paschal Taché Sir Étienne-Paschal Taché (5 September 1795 – 30 July 1865) was a Canadian medical doctor, politician, and Father of Confederation. His family had a long history in New France, but suffered serious financial reverses due to the Seven Y ...
, also a veteran of the battle, confirmed that O'Sullivan had written the letter. There was also an exchange of correspondence between O'Sullivan and de Salaberry shortly after the letter was published, which showed that he was the author. O'Sullivan's account of de Salaberry's role has become the accepted understanding of the battle. O'Sullivan stayed in the militia after the War of 1812 was over. In 1830, he was promoted to major, on transferring to 1st Militia Battalion of Montreal.


Legal career

After completing his courses at the Collège St-Raphaël, in 1805 O'Sullivan began his legal studies as an
articled clerk Articled clerk is a title used in Commonwealth countries for one who is studying to be an accountant or a lawyer. In doing so, they are put under the supervision of someone already in the profession, now usually for two years, but previously three ...
with
Denis-Benjamin Viger Denis-Benjamin Viger (; August 19, 1774 – February 13, 1861) was a 19th-century politician, lawyer, and newspaper publisher in Lower Canada, who served as joint premier of the Province of Canada for over two years. A leader in the Patri ...
, a brilliant young lawyer and future joint-premier of the
Province of Canada The Province of Canada (or the United Province of Canada or the United Canadas) was a British colony in British North America from 1841 to 1867. Its formation reflected recommendations made by John Lambton, 1st Earl of Durham, in the Report ...
. He left Viger in 1808 and finished his articles under Stephen Sewell, another leading lawyer in Montreal. O'Sullivan may have made the switch to ensure he was trained in both the civil law under Viger, and the
common law Common law (also known as judicial precedent, judge-made law, or case law) is the body of law primarily developed through judicial decisions rather than statutes. Although common law may incorporate certain statutes, it is largely based on prece ...
under Sewell. Knowing both systems would be an advantage for a lawyer in private practice in Montreal. He was called to the bar of Lower Canada in 1811. O'Sullivan built a large practice in Montreal and became known as an authority on the law. He began to take in articling students, some of whom went on to distinguished legal careers themselves. In 1818, he was one of a team of lawyers retained to defend
Lord Selkirk Earl of Selkirk is a title in the Peerage of Scotland, used since 1646. It has rules of inheritance subject to unusual and unique provisions. History The title was created on 14 August 1646 for Lord William Douglas, third son of William Dougla ...
on charges in relation to the
Pemmican War The Pemmican War was a series of violent confrontations between the Hudson's Bay Company (HBC) and the North West Company (NWC) in the Canadas from 1812 to 1821. It started after the establishment of the Red River Colony by Thomas Douglas, 5th Ea ...
between the
Hudson's Bay Company The Hudson's Bay Company (HBC), originally the Governor and Company of Adventurers of England Trading Into Hudson’s Bay, is a Canadian holding company of department stores, and the oldest corporation in North America. It was the owner of the ...
and the
North-West Company The North West Company was a Canadian fur trading business headquartered in Montreal from 1779 to 1821. It competed with increasing success against the Hudson's Bay Company in the regions that later became Western Canada and Northwestern Onta ...
. Between 1829 and 1831, O'Sullivan had received several public appointments, including the role of commissioner for receiving evidence, and as justice of the peace and
King's Counsel A King's Counsel (Post-nominal letters, post-nominal initials KC) is a senior lawyer appointed by the monarch (or their Viceroy, viceregal representative) of some Commonwealth realms as a "Counsel learned in the law". When the reigning monarc ...
. In 1831 and 1832, he served as president of the Advocates Library and Law Institute of Montreal, and gave lectures on topics such as the history of Roman law.


Political career


''Parti canadien'' supporter

O'Sullivan's first principal, Viger, was a nationalist who supported the ''
Parti canadien The () or () was a primarily francophone political party in what is now Quebec founded by members of the liberal elite of Lower Canada at the beginning of the 19th century. Its members were made up of liberal professionals and small-scale ...
'', which represented the interests of French-speaking ''
Canadiens French Canadians, referred to as Canadiens mainly before the nineteenth century, are an ethnic group descended from French colonists first arriving in France's colony of Canada in 1608. The vast majority of French Canadians live in the provi ...
''. The ''Parti canadien'' members of the Assembly opposed the policies of the British governors, who generally favoured the English-speaking merchants and landholders. During his time with Viger, O'Sullivan began writing articles for ''
Le Canadien ''Le Canadien'' () was a French language newspaper published at various times in Lower Canada, then the Province of Canada, and finally the province of Quebec, at various times in the 19th century. It went through three different publication pha ...
'', a newspaper which supported the nationalist position. In 1814, O'Sullivan was elected to the two-member constituency of
Huntingdon county Huntingdon is a market town in the Huntingdonshire district of Cambridgeshire, England. The town was given its town charter by King John in 1205. It was the county town of the historic county of Huntingdonshire. Oliver Cromwell was born there ...
, south of Montreal, alongside
Austin Cuvillier Austin Cuvillier (August 20, 1779 – July 11, 1849) was a businessman and political figure in Lower Canada and Canada East. He was a successful ''Canadien'' businessmen, unusual when most businessmen in Lower Canada were British. He also w ...
, who would go on to be the first Speaker of the Legislative Assembly of the Province of Canada. O'Sullivan was re-elected in the election of 1817 and the two elections of 1820, but did not stand for re-election in 1824. In the Assembly, O'Sullivan tended to support the ''Parti canadien'' and his friend, James Stuart, which suited his reformist tendencies at that time. However, he was more interested in issues of government administration and judicial matters than the battles over constitutional principles which increasingly occupied the ''Parti canadien''. His decision to leave politics at the 1824 election may have reflected his movement away from the increasingly nationalist tone of the ''Parti canadien'', which became known as the ''Parti patriote'' a few years later. A classmate from the Collège St-Raphaël,
Jean-Moïse Raymond Jean-Moïse Raymond (January 5, 1787 – February 8, 1843) was a businessman, militia officer and political figure in Lower Canada, and briefly in Canada East (now Quebec), in the Province of Canada. He was active in a family business inh ...
, was elected in his place in 1824.


Sulpician supporter

O'Sullivan had a lifelong connection with the French Sulpician order of Catholic priests, who had taught him at Collège St-Raphaël. He acted as their lawyer on a number of matters, and also became involved in a dispute over the 1821 appointment of
Jean-Jacques Lartigue Jean-Jacques Lartigue, S.S., (20 June 1777 – 19 April 1840) was a Canadians, Canadian Society of Saint-Sulpice, Sulpician, who served as the first Roman Catholic Archdiocese of Montreal, Catholic Bishop of Montreal. Early life Lartigue wa ...
as the
auxiliary Auxiliary may refer to: In language * Auxiliary language (disambiguation) * Auxiliary verb In military and law enforcement * Auxiliary police * Auxiliaries, civilians or quasi-military personnel who provide support of some kind to a military se ...
and
suffragan A suffragan bishop is a type of bishop in some Christian denominations. In the Catholic Church, a suffragan bishop leads a diocese within an ecclesiastical province other than the principal diocese, the metropolitan archdiocese; the diocese led ...
Bishop of Montreal, acting for the Archbishop of Quebec,
Joseph-Octave Plessis Joseph-Octave Plessis (March 3, 1763 – December 4, 1825) was a Canadians, Canadian Catholic Church, Roman Catholic clergyman from Quebec. He was the first archbishop of the Roman Catholic Archdiocese of Quebec after the diocese was elevated to ...
. Although Lartigue was also a Sulpician and graduate of Collège St-Raphaël, he was a native ''canadien''. The predominantly French Sulpicians viewed his appointment as an encroachment on their dominance in Montreal, and made life unpleasant for the new suffragan bishop, including one challenge in 1823–1824 to the canonical validity of his appointment. O'Sullivan gave advice on the civil and canon law aspects of the dispute to the person who brought the challenge. He also toured Europe, supposedly on vacation, but in actuality to lobby against the appointment of Lartigue. O'Sullivan may have been involved in the movement to construct the new Notre-Dame Basilica, replacing the old Notre-Dame church, which prevented building a cathedral for the new bishop. The whole affair also had political implications, as Lartigue was the cousin of both
Louis-Joseph Papineau Louis-Joseph Papineau (; October 7, 1786 – September 23, 1871), born in Montreal, Province of Quebec (1763–1791), Quebec, was a politician, lawyer, and the landlord of the ''seigneurie de la Petite-Nation''. He was the leader of the reform ...
and Viger. Both were ardent nationalists and leading members of the ''Parti canadien''. They supported their cousin in the dispute. The timing of the dispute, and O'Sullivan's decision not to seek re-election in 1824, may have been related, and may have contributed to O'Sullivan's gradual movement away from the nationalist ''Parti canadien''.


The O'Sullivan–Caldwell duel

In 1819, while still a member of the Legislative Assembly, O'Sullivan fought a
duel A duel is an arranged engagement in combat between two people with matched weapons. During the 17th and 18th centuries (and earlier), duels were mostly single combats fought with swords (the rapier and later the small sword), but beginning in ...
with a Montreal doctor, William Caldwell, over the proposal to build a new hospital for Montreal. The cause of the duel was a speech O'Sullivan gave in the Assembly. Both men were wounded and survived, each with a permanent disability. Montreal in 1819 had two hospitals,
Hôtel-Dieu de Montréal The Hôtel-Dieu de Montréal (; founded in 1645) was the first hospital established in Montreal, Quebec, Canada. ''Hôtel-Dieu'', literally translated in English as ''Hotel of God'', is an archaic French term for hospital, referring to the ori ...
and Hôpital général des frères Charron (also known as the Grey Nuns Hospital), both operated by the Catholic church, in French. The dispute began in January 1819, when
John Molson John Molson (28 December 1763 – 11 January 1836) was an English people, English-born brewer and entrepreneur in colonial Province of Quebec (1763–91), Quebec, which during his lifetime became Lower Canada. In addition to founding Molson Brewe ...
, a prominent brewer and businessman, presented a petition to the Legislative Assembly calling for the creation of a third hospital, non-denominational, to operate in English and serve the English-speaking community of Montreal. The supporters of the project argued that the Hôtel-Dieu was over-crowded and could no longer serve the Montreal population, which had been steadily expanding. The ''Montreal Gazette'' editorialised against the project, saying that the Hôtel-Dieu could fulfill Montreal's needs for the foreseeable future. O'Sullivan, a strong supporter of the Catholic church, opposed the proposal. In a provocative speech in the Assembly, laced with satire, he spoke fervently against the need for a new hospital, arguing that expanding the Hôtel-Dieu was preferable to wasting funds on building a new one, and hinted that the new hospital would conduct experiments on its patients. He also likely feared that the new hospital would attract patients away from Hôtel-Dieu. Dr Caldwell, a Montreal physician and surgeon, was one of the principal proponents of the new hospital. He wrote a letter to the ''Canadian Courant'' newspaper, giving a reasoned response to the criticisms that O'Sullivan had raised, but ended the letter by implying that O'Sullivan lacked personal courage. O'Sullivan responded by challenging Caldwell to a duel, a challenge accepted by Caldwell, a Scottish veteran of the
Napoleonic Wars {{Infobox military conflict , conflict = Napoleonic Wars , partof = the French Revolutionary and Napoleonic Wars , image = Napoleonic Wars (revision).jpg , caption = Left to right, top to bottom:Battl ...
. The two ex-military men met at 6 am on April 11, 1819, accompanied by their
seconds The second (symbol: s) is a unit of time derived from the division of the day first into 24 hours, then to 60 minutes, and finally to 60 seconds each (24 × 60 × 60 = 86400). The current and formal definition in the International System of ...
, near the future site of the Victoria Bridge. The duel was fought with pistols, and may have been the longest duel ever fought in Canada. Unusually for the dueling code of the time, it was agreed that each would fire five shots, instead of the customary one or two. It appeared that both men had fiery temperaments. A contemporary report indicated that both were wounded. One of Caldwell's arms was shattered by a ball, an injury that prevented him from practising surgery ever again. O'Sullivan was hit twice, including one wound that left a ball lodged close to his spine in an inoperable position. He walked with a limp for the rest of his life, sometimes in severe pain. In the end, the
Montreal General Hospital The Montreal General Hospital (MGH) () is a hospital in Montreal, Quebec, Canada established in the years 1818–1820. The hospital received its charter in 1823. It is currently part of the McGill University Health Centre (MUHC) and is located ...
opened in 1823, financed by private donations, along with the Montreal Medical Institution, the forerunner to the McGill Medical School. Caldwell taught medicine at the Institute and later the Medical School.


Later career and death

By the 1830s, O'Sullivan had gradually moved towards the
Tory A Tory () is an individual who supports a political philosophy known as Toryism, based on a British version of traditionalist conservatism which upholds the established social order as it has evolved through the history of Great Britain. The To ...
political viewpoint. His second wife's family and associates tended to the more conservative positions, and one of the witnesses to their marriage was
Joseph Papineau Joseph Papineau (; October 16, 1752 – July 8, 1841) was a civil law notary, notary, seigneurial system of New France, seigneur, and political figure in Lower Canada. Between 1773 and 1775, he worked as a surveyor. Papineau was also a hort ...
, the conservative father of the ''Patriote'' firebrand, Louis-Joseph Papineau. In 1833, the Governor General appointed O'Sullivan to the position of solicitor-general of Lower Canada, citing O'Sullivan's "Public Estimation in this Province for probity, Professional ability & sound constitutional principles in politics." In November 1837, as the unrest grew which would culminate in the
Lower Canada Rebellion The Lower Canada Rebellion (), commonly referred to as the Patriots' Rebellion () in French, is the name given to the armed conflict in 1837–38 between rebels and the colonial government of Lower Canada (now southern Quebec). Together wit ...
, O'Sullivan, along with Attorney General
Charles Richard Ogden Charles Richard Ogden, (February 6, 1791 – February 19, 1866) was a Joint Premier of the Province of Canada for Canada East from 1841 to 1842 with William Henry Draper PM for Canada West. Odgen was a member of the Château Clique, the gr ...
, wrote a legal opinion for Governor General Lord Gosford, which held that the Governor General had the power to declare
martial law Martial law is the replacement of civilian government by military rule and the suspension of civilian legal processes for military powers. Martial law can continue for a specified amount of time, or indefinitely, and standard civil liberties ...
in the event of a rebellion. Gosford relied on that opinion when he declared martial law in the district of Montreal on December 5, 1837. In November 1838, O'Sullivan was appointed Chief Justice of the Court of Queen's Bench for the district of Montreal, but only served for a single term in February 1839. He died on March 7, 1839, aged 54. An autopsy found Caldwell's ball from the duel 20 years prior lodged against the middle of O'Sullivan's spine. He was buried from Notre-Dame in Montreal.


References

{{DEFAULTSORT:OSullivan, Michael 1784 births 1839 deaths Pre-Confederation Quebec people Members of the Legislative Assembly of Lower Canada Politicians from Montreal Anglophone Quebec people Canadian Militia officers Battle of the Châteaugay veterans Canadian duellists Canadian King's Counsel Collège Saint-Raphaël alumni People from Clonmel Irish emigrants to pre-Confederation Quebec