Aq'uita'nia (later Aquitaine), a Roman province of Gaul which comprised the countries on the coast from the Garonne to the Pyrenees, and from the sea to Toulouse. It was brought into connection with England by the marriage of Henry II with Eleanor, daughter of the last duke of Aquitaine. The title to the province was for long a matter of dispute between England and France, but in 1451 it was secured by the latter.