Hvem giftet seg med Eustachie de Courtenay?

Guillaume de Brienne, né vers 1168 et mort en 1199, est un seigneur de Pacy-sur-Armançon. Il est le fils d'Érard II, comte de Brienne, et d'Agnès de Montbéliard.

William I of Champlitte (French: Guillaume de Champlitte) (1160s-1209) was a French knight who joined the Fourth Crusade and became the first prince of Achaea (1205–1209).

William I of Sancerre (French: Guillaume de Sancerre, ca. 1176 – 1217) was the second Count of Sancerre, Lord of Saint-Brisson and La Ferté-Loupière from 1191 until his death. He was the eldest son of Stephen I, Count of Sancerre. In 1217 he accompanied his brother-in-law, Peter II of Courtenay, who had just been elected Latin Emperor, on his journey to Constantinople. Both were captured and imprisoned by the ruler of Epirus, Theodore Komnenos Doukas, and died in prison. He was succeeded by his son, Louis I.