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Jean I de Grailly was born at Grilly near Gex on the shores of Lac Léman in the County ofSavoy. He probably travelled toEngland during the reign ofHenry III of England in the entourage ofPeter II of Savoy, In 1262 he was already a knight in the household of Prince Edward, the king's heir and future KingEdward I of England. In 1263 he had attained the status of a counsellor of the young prince. He was made Edward's Seneschal in Gascony from 1278.In 1279, Jean travelled to Amiens and to England to negotiate theTreaty of Amiens, which ended the state of war between Edward of England andPhilip III of France and returned the Agenais to English control. Jean de Grailly eventually fell short of funds for his activities, since his expenses need approval from the Exchequer before he could receive his salary. He took to exploitation and illegal exactions from the peasants, whose complaints eventually reached the ears of Edward I. He was removed from office sometime between June 1286 and Spring 1287. Led a French force alongside the English led byOtto de Grandson at the Fall ofAcre in 1291.