John I of Brienne (died 12 June 1294) was the son of

Alphonso of Brienne Alfonso of Brienne, called Alphonse d'Acre (c. 1228 – 14 September 1270), was the son of John of Brienne and Berengaria of León, born in Acre. Alfonso took part in the Seventh Crusade (1248) as a squire. By his marriage (before 1250) to ...

and Marie de Lusigan. His mother was the heiress of

Eu, Seine-Maritime Eu () is a commune in the Seine-Maritime department in the Normandy region in northern France. Eu is located near the coast in the eastern part of the department, near the border with Picardy. Its inhabitants are known in French as the ''Eudo ...

, and he succeeded his father as

Count of Eu Count (feminine: countess) is a historical title of nobility in certain European countries, varying in relative status, generally of middling rank in the hierarchy of nobility. Pine, L. G. ''Titles: How the King Became His Majesty''. New York: ...

in 1270. He married Beatrice, the daughter of

Guy III, Count of Saint-Pol Guy III of Châtillon, Count of Saint-Pol (died 1289) was a French nobleman, and was a younger son of Hugh I, Count of Blois, and Mary, Countess of Blois. While his elder brother John I of Châtillon succeeded to their mother's County of Blois, G ...

. They had: #

John II of Brienne, Count of Eu John II of Brienne (died 11 July 1302 in Kortrijk) was the son of John I of Brienne, Count of Eu and Beatrice of Saint-Pol. He succeeded his father as Count of Eu in 1294. He married Jeanne, Countess of Guînes (d. 1331 or 1332), the daughter and ...

# Isabelle (d. 1302 or 1307), married John II of Dampierre, Viscount of

Troyes Troyes () is a commune and the capital of the department of Aube in the Grand Est region of north-central France. It is located on the Seine river about south-east of Paris. Troyes is situated within the Champagne wine region and is near to ...

(d. c.1307) # Jeanne (d. aft. 12 March 1325), married first Raymond VI, Viscount of Turenne (d. 1304), married second before 4 August 1314 Renauld, Lord of

Picquigny Picquigny () is a commune in the Somme department in Hauts-de-France in northern France. Geography Picquigny is situated at the junction of the N235, the D141 and D3 roads, on the banks of the river Somme, some northwest (and downstream) of ...

vidame Vidame () was a feudal title in France, a term descended from mediaeval Latin . Like the ''avoué'' or ''advocatus'', the ''vidame'' was originally a secular official chosen by the bishop of the diocese—with the consent of the count—to pe ...

Amiens Amiens (English: or ; ; pcd, Anmien, or ) is a city and commune in northern France, located north of Paris and south-west of Lille. It is the capital of the Somme department in the region of Hauts-de-France. In 2021, the population of ...

(d. 1315) # Marguerite (d. 1310), married Guy,

Viscount of Thouars The first viscounts of Thouars appeared at the end of the 9th century, somewhat earlier than those of Châtellerault, Lusignan, etc. They represented the count of Poitou (also the duke of Aquitaine) in the territory he had enfeoffed to them. Th ...

(d. 1308). Guy was the son of Aimery IX and Margaret of Lusignan, who was the daughter of

Hugh X of Lusignan Hugh X de Lusignan, Hugh V of La Marche or Hugh I of Angoulême (c. 1183 – c. 5 June 1249, Angoulême) was Seigneur de Lusignan and Count of La Marche in November 1219 and was Count of Angoulême by marriage. He was the son of Hugh IX an ...

and

Isabella of Angoulême Isabella (french: Isabelle, ; c. 1186/ 1188 – 4 June 1246) was Queen of England from 1200 to 1216 as the second wife of King John, Countess of Angoulême in her own right from 1202 until her death in 1246, and Countess of La Marche from 122 ...

. # Mahaut (d. aft. 1328), married

Alfonso de la Cerda Alfonso de la Cerda, (Valladolid 1270 - Ávila 1333), called "the Disinherited", was the elder son of Ferdinand de la Cerda and his wife Blanche of France, and was a grandson of Alfonso X of Castile. Alfonso and his brother Fernando were cand ...

John died at

Clermont-en-Beauvaisis Clermont () is a commune in the Oise department in northern France. Clermont-de-l'Oise station has rail connections to Amiens, Creil and Paris. History Clermont was also known as Clermont-en-Beauvaisis or Clermont-de-l'Oise. The town is built o ...

in 1294.

References

Sources

* * {{DEFAULTSORT:John 01 of Brienne, Count of Eu 1294 deaths Counts of Eu House of Brienne Year of birth unknown Christians of the Sixth Crusade