 As a relative of the Plantagenets and of the sitting pope (Martin IV) and one of the most powerful lords in Gascony, he was the recipient of conspicuous royal largesse.In 1286 Amanieu ended a long private war with Jean Ferrars, the English seneschal of Gascony, in return for 20,000 "livres tournois" from Edward I.His son Bernard Ezi II succeeded him in Albret and on the Council.