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Captal de Buch, Jean III de Grailly (1343-1377) was a military leader in the Hundred Years' War.
Attached to the English side in the conflict, he was made Count of Bigorre by Edward III of England. He played a decisive role as a cavalry leader under Edward, the Black Prince in the Battle of Poitiers (1356). He defected to the French side and was made lord of Nemours by Charles V of France, but re-established his loyalty to the English and was rewarded by being made the Constable of Aquitaine.
In 1372, he was captured by the French near Soubise and was imprisoned in Paris until his death.
