The Seneschal of the Agenais was an officer carrying out and managing the domestic affairs of the lord of the former county and district of Agenais. During the course of the twelfth century, the seneschalship, also became an office of military command.
The seneschal managed the household, coordinating between the receivers of various landholdings and the chamber, treasury, and the chancellory or chapel. The seneschals of the Agenais, like those appointed in Périgord, Poitou, and Najou had custody of demesne fortresses, the regional treasuries, and presidency of the highest court of regional custom.