Tags: Noble.
John I of Brienne (died 12 June 1294) was the son of Alphonso of Brienne and Marie de Lusigan. His mother was the heiress of Eu Seine-Maritime 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.