Guillaume de Brienne

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About Guillaume de Brienne (retrieved 21 December 2019)

Guillaume de Brienne († 1199) was Lord of Pacy-sur-Armançon . He was the son of Erard II , count of Brienne, and of Agnes de Montbéliard.

He married around 1188 Eustachie de Courtenay, daughter of Pierre de France , lord of Courtenay, and of Elisabeth de Courtenay, including two children:

  • André de Brienne († circa 1215).
  • Helvise de Brienne who married Viscount Jean de Saint Florentin.

In 1196, Pierre II de Courtenay , Count of Auxerre, of a violent nature and easily taking up arms 1 , needing money, would have tried to use himself on the lands of his vassals 2 .

Guillaume, who was his brother-in-law, rebelled against him and, at the head of an army of Champenois, to which one could count his brothers, traversed all the grounds of Pierre and ruined several of his places of the valley of the Cure, including villages dependent on the Abbey of the Madeleine. He then besieged Vezelay , but failed to take the place, contenting himself with burning the surrounding villages, including Précy sous Pierre-Perthuis, Foissy, Asquins, Versigny, Varigny and Blannay. Pierre was then forced into peace and had to give up his bellicose plans. Finally, in 1199, they were reconciled, because at the time of the donation which Guillaume made to the abbeys of Pontigny and Quincy, he chose, as surety for the rent he ceded, his brother-in-law 3 . The exact date of the death of Guillaume, which occurred during this year 1199, is not known, but at the end of this year his wife Eustachie confirming the donation that her husband had made to the abbeys of Pontigny and Quincy , specifies that he was then dying 4 ..

Finally, in October 1200, the Count of Champagne Thibaut III of Champagne gave the Saint-Michel de Tonnerre abbey the sum of 20 sous for the rest of the soul of his dear and familiar Guillaume de Brienne 5 hoping to buy back by this means resting the soul of the deceased, who in his lifetime had caused great damage to the monks 4 .

Supporting data

ERARD [II] de Brienne, son of GAUTHIER [II] Seigneur de Brienne & his [first/second] wife Humbeline de Baudément (-8 Feb [1190/91]). .... (before 1166) AGNES de Montbéliard, daughter of AMEDEE de Montfaucon Comte de Montbéliard & his first wife Beatrix - ([1150/55]-23 Oct -, after 1186).

Comte Erard [II] & his wife had five children:

2. GUILLAUME de Brienne (-[1194/99], bur Auxerre St-Etienne). ... m as her first husband, EUSTACHIE de Courtenay Dame de Placy-sur-Armancon, daughter of PIERRE de France Seigneur de Courtenay & his wife Elisabeth de Courtenay (-6 Apr after 1235). She married secondly (1200) as his third wife, Guillaume de Champlitte, who was appointed Prince of Achaia in 1205, and thirdly ([1211]%29 as his third wife, Guillaume [I] Comte de Sancerre. ...

Guillaume & his wife had two children:

a) ANDRE de Brienne (-before May 1215, bur Auxerre Saint-Etienne). “Eustachia comitissa Sacricesaris” recorded that “filius meus...bone memorie Andreas de Brena” had requested her and “fratri meo Willelmo de Tanlay” to carry out his last wishes, and founded an anniversary for him at Auxerre Saint-Etienne where he was buried, by charter dated May 1215[104].

b) ELVIS de Brienne . The primary source which confirms her parentage and marriage has not yet been identified. m JEAN Vicomte de Saint-Florentin, son of - (-before Jul 1235).


  • cites:
  • Society of Historical and Natural Sciences of Yonne Volume 22 - 1868
  • Olivier Jacques Chardon: History of the city of Auxerre
  • Abbé Lebeuf Memoirs concerning the civil and ecclesiastical history of Auxerre - 1855
  • Back higher in: a and b Cartulaire de l'Yonne Tome II
  • MH d'Arbois de Jubainville, History of the Dukes and Counts of Champagne - 1865
  • Guy Perry, John of Brienne: King of Jerusalem, Emperor of Constantinople, c.1175-1237, (Cambridge University Press, 2013), Page 25 & 34 GoogleBooks
  • A History of the Counts of Brienne (950 – 1210) Dana Celest Asmoui Ismail. Royal Holloway University of London (2013) PDF page 172.