Alphonse, Count of Poitiers

Alphonse of Poitiers (1220–1271) was a younger son of King Louis VIII of France and Blanche of Castile, and a brother of Louis IX. Granted Poitou and Auvergne as his appanage, he fought beside Louis IX at Taillebourg in 1242 against Henry III of England. By the 1229 Treaty of Paris he married Joan, only child of Count Raymond VII of Toulouse, and inherited Toulouse in 1249.

He and Charles of Anjou served as regents after Blanche's death in 1252. He joined the Eighth Crusade and died at Savona in 1271 without heirs, his lands reverting to the crown.