'John I of Brienne' (d.
June 12,
1294) was the son of
Alphonso of Brienne and Marie d'Issoudon. His mother was the heiress of
Eu, and he succeeded his father as
Count of Eu in
1270.
He married Beatrice, the daughter of
Guy II of Châtillon,
Count of Saint Pol. They had five children:
#
John II of Brienne, Count of Eu (d. 1302)
# Isabelle (d. 1302/07), married John II of Dampierre, Viscount of
Troyes (d. c.1307)
# Jeanne (d. aft.
March 12,
1325), married first Raymond VI, Viscount of Turenne (d. 1304), married second before
August 4,
1314 Renauld, Lord of
Picquigny,
vidame of
Amiens (d. 1315)
# Marguerite (d. 1310), married Guy, Viscount of Thouars (d. 1308)
# Mahaut (d. aft. 1328), married Alfonso de la Cerda (1270–1324)
John died at
Clermont-en-Beauvaisis in 1294.
References
★
Foundation for Medieval Genealogy
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