Isabella of Aragon
Isabella of Aragon (c. 1247–1271) was the youngest daughter of King James I of Aragon. Betrothed to Philip, second son of Louis IX, under the Treaty of Corbeil of 1258, she married him in 1262.
She joined the Eighth Crusade in 1270 and became queen of France when Louis IX died in August. On the journey home she fell from her horse while six months pregnant, gave birth prematurely, and died at Cosenza on 28 January 1271. Her sons included Philip IV and Charles of Valois.