Claude de Mesmes, comte d'Avaux (; 1595–1650) was a 17th-century French diplomat and public administrator. He was sent in various missions to
Venice
Venice ( ; ; , formerly ) is a city in northeastern Italy and the capital of the Veneto Regions of Italy, region. It is built on a group of 118 islands that are separated by expanses of open water and by canals; portions of the city are li ...
,
Rome
Rome (Italian language, Italian and , ) is the capital city and most populated (municipality) of Italy. It is also the administrative centre of the Lazio Regions of Italy, region and of the Metropolitan City of Rome. A special named with 2, ...
,
Germany
Germany, officially the Federal Republic of Germany, is a country in Central Europe. It lies between the Baltic Sea and the North Sea to the north and the Alps to the south. Its sixteen States of Germany, constituent states have a total popu ...
,
Sweden
Sweden, formally the Kingdom of Sweden, is a Nordic countries, Nordic country located on the Scandinavian Peninsula in Northern Europe. It borders Norway to the west and north, and Finland to the east. At , Sweden is the largest Nordic count ...
,
Denmark
Denmark is a Nordic countries, Nordic country in Northern Europe. It is the metropole and most populous constituent of the Kingdom of Denmark,, . also known as the Danish Realm, a constitutionally unitary state that includes the Autonomous a ...
, and
Poland
Poland, officially the Republic of Poland, is a country in Central Europe. It extends from the Baltic Sea in the north to the Sudetes and Carpathian Mountains in the south, bordered by Lithuania and Russia to the northeast, Belarus and Ukrai ...
by
Richelieu.
In 1635 he guided the negotiations of the
Treaty of Stuhmsdorf
The Treaty of Stuhmsdorf (), or Sztumska Wieś (), was a treaty signed on 12 September 1635 between the Polish–Lithuanian Commonwealth and the Swedish Empire in the village of Stuhmsdorf, Crown of the Kingdom of Poland, Poland (now Sztumska Wi ...
, which extended the truce between Poland and Sweden. These two countries had fought each other in the
Polish-Swedish war
This is a List of wars between the Polish–Lithuanian Commonwealth and Sweden
Sweden, formally the Kingdom of Sweden, is a Nordic countries, Nordic country located on the Scandinavian Peninsula in Northern Europe. It borders Norway to ...
of 1626–1629, which had ended in a truce rather than a peace. France wanted peace between Poland and Sweden as the Swedes were fighting for France in Germany and the Poles would have menaced their flank.
In 1638 he negotiated a new alliance between France and Sweden in the
Treaty of Hamburg. He also was plenipotentiary at the
Peace of Westphalia
The Peace of Westphalia (, ) is the collective name for two peace treaties signed in October 1648 in the Westphalian cities of Osnabrück and Münster. They ended the Thirty Years' War (1618–1648) and brought peace to the Holy Roman Empire ...
and ended his career as
Superintendent of Finances
The Superintendent of Finances () was the name of the minister in charge of finances in France from 1561 to 1661. The position was abolished in 1661 with the downfall of Nicolas Fouquet, and a new position was created, the Controller-General of ...
.
Birth and origins
Claude was born in 1595 as one of five children, three sons and two daughters, of Jean-Jacques de Mesmes and his wife Antoinette de Grossaine. His father was knight and seigneur de
Roissy, numbered Jean-Jacques II de Mesmes in the Paris branch of the family. His mother was a rich heiress, who had brought her husband the seigneuries of
Avaux, Irval, Breuil, Besancourt, Bellefontaine, and
Vandeuil.
He appears below among his brothers as the second son:
#Henri (1585–1650), who was numbered Henri II de Mesmes and became ''
président à mortier
President most commonly refers to:
*President (corporate title)
*President (education), a leader of a college or university
*President (government title)
President may also refer to:
Arts and entertainment Film and television
*'' Præsidente ...
'' at the
parlement
Under the French Ancien Régime, a ''parlement'' () was a provincial appellate court of the Kingdom of France. In 1789, France had 13 ''parlements'', the original and most important of which was the ''Parlement'' of Paris. Though both th ...
of Paris
#Claude (1595–1650)
#Jean-Antoine (1598–1673), who inherited Henri's office of président à mortier and was the only one of the brothers that fathered sons
His sisters were Jeanne and Judith:
#Jeanne, who married François Lambert d'Herbigny
#Judith, who married
Judicial and administrative career
He followed his elder brother Henri by starting a career at the parlement of Paris. He became
maître des requêtes
A Master of Requests () is a counsel of the French ''Conseil d'État'' (Council of State), a high-level judicial officer of administrative law in France. The office has existed in one form or another since the Middle Ages.
The occupational titl ...
and then, in 1623, conseiller d'état.
Comte d'Avaux
In January 1638
Louis XIII
Louis XIII (; sometimes called the Just; 27 September 1601 – 14 May 1643) was King of France from 1610 until his death in 1643 and King of Navarre (as Louis II) from 1610 to 1620, when the crown of Navarre was merged with the French crown.
...
raised the seigneurie of
Avaux to a ''comté'' for him and his father. However, the act was only registered in 1648. Strictly speaking, Claude de Mesmes therefore became comte d'Avaux only late in his life, in 1648, whereas his father never became count as he died in 1642, well before the registration date. However, Claude de Mesmes used the title immediately in 1638 for his negotiations in Hamburg. Surely that was what the king intended. In the French version of the Treaty of Hamburg, he writes ''Nous, Claude de Mesmes, Comte d'Avaux, Conseiller d'Etat'', whereas in the Treaty of Stuhmdorf of 1635, he still was only ''Dominus de Avaux'' (Seigneur d'Avaux).
Claude de Mesmes was the second comte d'Avaux according to the numbering found in Boulliot, so his father seems to have been accepted and counted as the first comte d'Avaux.
His portrait by
Anselm van Hulle
Anselm van Hulle or Anselmus van Hulle (Ghent, Gent, 1601 - 1674/1694) was a Southern Netherlands, Flemish painter mainly of portraits whose works were highly prized at the Northern European Courts. He was court painter to the Prince of Orange a ...
is adorned with his coat of arms. The
escutcheon is surmounted by the coronet of a French count. By error, as it seems, the coronet has seven rather than the usual nine balls. The escutcheon is quartered. First quarter: Or crescent sable (for Mesmes). Second and third quarter: argent two lions passant gules (for
Bigorre
Bigorre (; Gascon: ''Bigòrra'') is a region in southwest France, historically an independent county and later a French province, located in the upper watershed of the Adour, on the northern slopes of the Pyrenees, part of the larger region k ...
). Fourth quarter: Or, chief gules, base azure waved, charge mullet sable (for Lassus in Guyenne). A red
label
A label (as distinct from signage) is a piece of paper, plastic film, cloth, metal, or other material affixed to a container or product. Labels are most often affixed to packaging and containers using an adhesive, or sewing when affix ...
with three pendants appears on the head of the escutcheon. This label would have been needed before his father's death, in 1642, to indicate that he was a cadet and his father was the count. However, the date on the engraving is 1648. This seems another error.
Order of the Holy Spirit
On 5 April 1637 Claude de Mesmes became ''greffier'' (secretary) of the
Order of the Holy Spirit
The Order of the Holy Spirit (; sometimes translated into English as the Order of the Holy Ghost) is a French order of chivalry founded by Henry III of France in 1578. Today, it is a dynastic order under the House of France.
It should not be c ...
. This office allowed him to wear the ''cordon bleu'', which is the blue sash shown on his portraits.
The offices of this order are often passed on in families, but Claude de Mesmes (now d'Avaux) sold his in 1643 to Noël de Bullion, sieur de Bonnelles.
Father's death and partition
His father decided to share his possessions between his three sons. At the father's death, in 1642, Henri inherited Roissy, the traditional main seat of the family and the family's townhouse in Paris. Claude, our subject here, inherited Avaux and with it the title of comte d'Avaux. Jean-Antoine, the youngest brother, inherited Irval and probably Vandeuil, which is the village next to Irval Castle.
Diplomatic career
As diplomat Claude de Mesmes first served under
Cardinal Richelieu
Armand Jean du Plessis, 1st Duke of Richelieu (9 September 1585 – 4 December 1642), commonly known as Cardinal Richelieu, was a Catholic Church in France, French Catholic prelate and statesman who had an outsized influence in civil and religi ...
, the first minister of
Louis XIII
Louis XIII (; sometimes called the Just; 27 September 1601 – 14 May 1643) was King of France from 1610 until his death in 1643 and King of Navarre (as Louis II) from 1610 to 1620, when the crown of Navarre was merged with the French crown.
...
, and then under
Cardinal Mazarin
Jules Mazarin (born Giulio Raimondo Mazzarino or Mazarini; 14 July 1602 – 9 March 1661), from 1641 known as Cardinal Mazarin, was an Italian Catholic prelate, diplomat and politician who served as the chief minister to the Kings of France Lou ...
, who took over as first minister from Richelieu in 1642. He was sent to Italy and then into northern Europe: Poland, Denmark and Sweden. Finally, he participated in the negotiations for the
Peace of Westphalia
The Peace of Westphalia (, ) is the collective name for two peace treaties signed in October 1648 in the Westphalian cities of Osnabrück and Münster. They ended the Thirty Years' War (1618–1648) and brought peace to the Holy Roman Empire ...
.
Italy
Claude de Mesmes's first major post was French ambassador to
Venice
Venice ( ; ; , formerly ) is a city in northeastern Italy and the capital of the Veneto Regions of Italy, region. It is built on a group of 118 islands that are separated by expanses of open water and by canals; portions of the city are li ...
, where he arrived in 1627, just one year before the outbreak of the
War of the Mantuan Succession
The War of the Mantuan Succession, from 1628 to 1631, was caused by the death in December 1627 of Vincenzo II, last male heir from the House of Gonzaga, long-time rulers of Mantua and Montferrat. Their strategic importance led to a proxy war b ...
(1628–1631), which was triggered by the death of
Vincenzo II, the last male of the Mantuan
Gonzaga line. Several candidates contended the succession. The emperor supported
Charles Emmanuel I, Duke of Savoy
Charles Emmanuel I (; 12 January 1562 – 26 July 1630), known as the Great, was the Duke of Savoy and ruler of the Savoyard states from 30 August 1580 until his death almost 50 years later in 1630, he was the longest-reigning Savoyard monarch ...
, whereas France and Venice supported
Charles Gonzaga, duc de Nevers. In 1629 an Imperial army beleaguered and took Mantua, but the troops were soon recalled to Germany to fight in the
Thirty Years' War
The Thirty Years' War, fought primarily in Central Europe between 1618 and 1648, was one of the most destructive conflicts in History of Europe, European history. An estimated 4.5 to 8 million soldiers and civilians died from battle, famine ...
(1618–1648). France therefore prevailed and the duc de Nevers acceded to the ducal throne of Mantua.
Claude de Mesmes did not hesitate to spend money to enhance the prestige of France and his king: in October 1628 he celebrated the
capture of La Rochelle by feasts and firework in Venice.
After Venice he was sent to Rome, Mantua, Florence and Turin.
Treaty of Stuhmsdorf
During the later phase of the Thirty Years' War, France was allied with Sweden. Richelieu feared that the Polish menace on their left flank would distract the Swedes from fighting the emperor in Germany. The
Polish-Swedish war of 1626–1629 had ended with the
truce signed at Altmark after the Swedish defeat at
Honigfelde. This truce was to expire in July 1635 and the new Polish king,
Władysław IV Vasa
Władysław IV Vasa or Ladislaus IV (9 June 1595 – 20 May 1648) was King of Poland, Grand Duke of Lithuania and claimant of the thrones of Monarchy of Sweden, Sweden and List of Russian monarchs, Russia. Born into the House of Vasa as a prince ...
, seemed poised to resume the war.
To ensure a timely renewal of the truce, Richelieu sent Claude de Mesmes to Poland as a mediator. The French delegation left Paris on 11 July 1634. Claude de Mesmes was accompanied among others by his secretary , who kept a diary. Avoiding war-torn Germany, the delegation travelled via Denmark and Sweden. On the way Claude de Mesmes stopped in Copenhagen in 1634 to represent France at the wedding of crown prince
Christian
A Christian () is a person who follows or adheres to Christianity, a Monotheism, monotheistic Abrahamic religion based on the life and teachings of Jesus in Christianity, Jesus Christ. Christians form the largest religious community in the wo ...
with
Magdalene Sibylle of Saxony. While in Copenhagen they received the news of the Swedish
defeat at Nördlingen on 27 August (old style), which further weakened Sweden's position. From Denmark the delegation travelled to Sweden where they passed the winter and met officials in Stockholm. They arrived in Dantzig (now
Gdańsk
Gdańsk is a city on the Baltic Sea, Baltic coast of northern Poland, and the capital of the Pomeranian Voivodeship. With a population of 486,492, Data for territorial unit 2261000. it is Poland's sixth-largest city and principal seaport. Gdań ...
) on 17 May 1635 and proceeded to Marienburg (now
Malbork
Malbork (German: ''Marienburg'') is a town in the Pomeranian Voivodeship, Poland. It is the seat of Malbork County and has a population of 36,709 people as of 2024. The town is located on the Nogat river, in the historical region of Pomerelia.
Fo ...
) where they took up quarters in the
castle
A castle is a type of fortification, fortified structure built during the Middle Ages predominantly by the nobility or royalty and by Military order (monastic society), military orders. Scholars usually consider a ''castle'' to be the private ...
.
The French delegation arrived late. The negotiations had started on 24 January in the church of the small town of Holland (now
Pasłęk) in
Ducal Prussia
The Duchy of Prussia (, , ) or Ducal Prussia (; ) was a duchy in the region of Prussia established as a result of secularization of the Monastic Prussia, the territory that remained under the control of the State of the Teutonic Order until t ...
. The Brandenburger delegation, which was mediating, stayed in that town. The Polish delegation (in fact the one representing the
Polish–Lithuanian Commonwealth
The Polish–Lithuanian Commonwealth, also referred to as Poland–Lithuania or the First Polish Republic (), was a federation, federative real union between the Crown of the Kingdom of Poland, Kingdom of Poland and the Grand Duchy of Lithuania ...
) stayed at Mohrungen (now
Morąg
Morąg (; , ) is a town in northern Poland in Ostróda County in the Warmian-Masurian Voivodeship. It is the seat of Gmina Morąg (commune).
Geography
The town is situated in the western uplands of the historic Prussia region. Its centre is loc ...
). Brandenburg was represented by Siegmund of Brandenburg, , and Peter Bergmann. Siegmund of Brandenburg was a cousin of the ruling elector
George William. The Polish delegation was led by the
great chancellor of the crown Jakub Zadzik. The
magnate
The term magnate, from the late Latin ''magnas'', a great man, itself from Latin ''magnus'', "great", means a man from the higher nobility, a man who belongs to the high office-holders or a man in a high social position, by birth, wealth or ot ...
Rafał Leszczyński also was part of the Polish delegation. He wanted peace but mainly for religious reasons as he was a Calvinist. The Swedish delegation stayed in Elbing (now
Elbląg
Elbląg (; ; ) is a city in the Warmian-Masurian Voivodeship, in northern Poland, located in the eastern edge of the Żuławy region with 127,390 inhabitants, as of December 2021. It is the capital of Elbląg County.
Elbląg is one of the ol ...
), 30 km to the north-west, which was the seat of the Swedish authorities in Prussia. It was led by
Count Brahe. The English delegation arrived some weeks late and participated in the talks from the 5th of February on. It was led by Sir George Douglas of Mordington (died 1636), who was assisted by Francis Gordon (died 1643), the English agent at Dantzig. The negotiations at Holland soon stalled.

However, King Władysław asked Douglas and Bergmann to make another attempt in which the French delegation participated. The negotiations restarted on 28 May at Stuhmsdorf (now
Sztumska Wieś). The delegations moved to new quarters. The Polish delegation moved to Marienwerder (now
Kwidzyn
Kwidzyn (; ; Latin: ''Quedin''; Old Prussian: ''Kwēdina'') is a town in northern Poland on the Liwa River. With a population of 36,731, it is the capital of Kwidzyn County in the Pomeranian Voivodeship.
Geography
Kwidzyn is located on the L ...
), where they stayed in the
castle
A castle is a type of fortification, fortified structure built during the Middle Ages predominantly by the nobility or royalty and by Military order (monastic society), military orders. Scholars usually consider a ''castle'' to be the private ...
. The Swedish delegation moved to Jonasdorf (also called Johannsdorf and now
Janówka) to the north-east of Marienburg. The mediators stayed in Marienburg Castle. Stuhmsdorf was chosen as the meeting-place because it was about equidistant between Marienwerder and Jonasdorf. The negotiations led to the signing of the
Treaty of Stuhmsdorf
The Treaty of Stuhmsdorf (), or Sztumska Wieś (), was a treaty signed on 12 September 1635 between the Polish–Lithuanian Commonwealth and the Swedish Empire in the village of Stuhmsdorf, Crown of the Kingdom of Poland, Poland (now Sztumska Wi ...
on 2 September 1635 (old style).
Renewals of the alliance with Sweden

France supported Sweden almost right from the beginning of the Swedish intervention in the Thirty Years' War, which started in earnest with
Gustavus Adolphus
Gustavus Adolphus (9 December N.S 19 December">Old_Style_and_New_Style_dates.html" ;"title="/nowiki>Old Style and New Style dates">N.S 19 December15946 November Old Style and New Style dates">N.S 16 November] 1632), also known in English as ...
's invasion of
Pomerania
Pomerania ( ; ; ; ) is a historical region on the southern shore of the Baltic Sea in Central Europe, split between Poland and Germany. The central and eastern part belongs to the West Pomeranian Voivodeship, West Pomeranian, Pomeranian Voivod ...
in 1630. In the
Treaty of Bärwalde
The Treaty of Bärwalde (; ; ), signed on 23 January 1631, was an agreement by France to provide Sweden financial support, following its intervention in the Thirty Years' War.
This was in line with Cardinal Richelieu's policy of avoiding direct ...
in 1631 France promised a subvention of 1,000,000
livres
Livre may refer to:
Currency
* French livre, one of a number of obsolete units of currency of France
* Livre tournois, one particular obsolete unit of currency of France
* Livre parisis, another particular obsolete unit of currency of France
* F ...
(400,000 Riksdaler) per year to the Swedish army.
Richelieu sent d'Avaux (as he was called now) to Hamburg in 1638 to negotiate a new alliance with
Johan Adler Salvius, sent by
Queen Christina. The negotiations led to the
Treaty of Hamburg, signed on 15 March 1638, an extension of the alliance between France and Sweden for three year. This alliance was again renewed in 1641.
Peace of Westphalia
In 1642 Richelieu died and Mazarin took over as chief minister. D'Avaux's relationship with Mazarin was difficult as he was considered part of the previous administration. In 1643 he was sent to Germany to take part in the lengthy negotiations that eventually led to the
Peace of Westphalia
The Peace of Westphalia (, ) is the collective name for two peace treaties signed in October 1648 in the Westphalian cities of Osnabrück and Münster. They ended the Thirty Years' War (1618–1648) and brought peace to the Holy Roman Empire ...
, which ended the
Thirty Years' War
The Thirty Years' War, fought primarily in Central Europe between 1618 and 1648, was one of the most destructive conflicts in History of Europe, European history. An estimated 4.5 to 8 million soldiers and civilians died from battle, famine ...
. In 1644 the official negotiations started in
Münster
Münster (; ) is an independent city#Germany, independent city (''Kreisfreie Stadt'') in North Rhine-Westphalia, Germany. It is in the northern part of the state and is considered to be the cultural centre of the Westphalia region. It is also a ...
where the Catholic delegations resided. The French delegation was led by the
duc de Longueville, and comprised
Anne-Geneviève de Bourbon-Condé, the leader's wife, d'Avaux, and
Abel Servien
Abel Servien, marquis de Sablé et de Boisdauphin and Comte de La Roche des Aubiers (1 November 159317 February 1659) was a French diplomat who served Cardinal Mazarin and signed for the French the Treaty of Westphalia. He was an early member of th ...
. D'Avaux, who was more conciliatory, repeatedly clashed with Abel Servien, who was more demanding and had been dubbed "l'ange exterminateur de la paix" (the peace-killing angel) by the negotiators. D'Avaux was finally excluded from the negotiations.
Townhouse
Between 1644 and 1650 d'Avaux built himself a new stylish townhouse in the
Marais quarter of Paris. It was designed by
Pierre Le Muet. The present address is 71 rue du Temple, but in his time this plot was in rue Sainte-Avoye. This mansion stayed in the family until 1688, when it was sold to
Paul de Beauvilliers, the future 2nd duc of St Aignan for 153,000 livres. It therefore became known as the
Hôtel de Saint-Aignan. This house must not be confused with the Hôtel de Mesmes, which stood almost opposite to it on the other side of the same street. His elder brother Henri lived in the Hôtel de Mesmes.
Later life, death, and timeline
Although the dispute with Servien damaged his reputation, d'Avaux ended his career as a member of the high Council of the Realm and superintendent of finances (1649–1650). His nephew
Jean-Antoine (died 1709) was to follow in his footsteps and become the other famous diplomat of the family.
D'Avaux died on 19 November 1650. He had never married. At his death, the title and most of the lands passed to Jean-Antoine (Jean-Antoine I de Mesmes), his younger brother, because Henri, his elder brother, had died some months before him, also in 1650, and left no male heir. Jean-Antoine also inherited his elder brother Henri's charge as ''président à mortier'' of the Parlement of Paris.
Notes and references
Notes
Citations
Sources
* – Knights of the Order of the Holy Spirit and general index
*
*
*
*
* – A to J (for Avaux)
* – 1631 to 1666
*
*
*
* – AUD to BER (for Avaux & Belleforière)
* – MAL to MON (for Mesmes)
* – F to Z
*
* – M to N
*
*
*
*
*
* – 1703
* – 1711 to 1712
*
*
Further reading
*
External links
Racines Histoire
{{DEFAULTSORT:Avaux, Claude d
1595 births
1650 deaths
17th-century French diplomats
Finance ministers of France