The Seneschal of Gascony was an officer carrying out and managing the domestic affairs of the lord of the Duchy of Gascony. During the course of the twelfth century, the seneschalship also became an office of military command. After 1360, the officer was the Seneschal of Aquitaine.[1] There was an office above the seneschalcy, the Lieutenancy of the Duchy of Aquitaine, but it was filled only intermittently (in times of emergency).
The seneschal managed the household, coordinating between the receivers of various landholdings and the chamber, treasury, and the chancellory or chapel. The seneschals of Gascony, like those appointed in Normandy, Poitou, and Anjou, had custody of demesne fortresses, the regional treasuries, and presidency of the highest court of regional custom. Detailed records of the Gascon Exchequers during the reign of Henry III of England indicate that there most likely was a functioning exchequer.