John I of Brienne, Count of Eu
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John I of Brienne (d. June 12, 1294, Clermont-en-Beauvaisis) 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)
| Preceded by Alphonso with Marie |
Count of Eu 1270–1294 |
Succeeded by John II |
