or Agenois
Historical region, southwestern France.
In ancient Gaul , Agenais was the country of the Nitrobriges, then a Gallo-Roman civitas , whose limits became those of the diocese of Agen. It was acquired by the dukes of Aquitaine in 1036. When Eleanor of Aquitaine married the future Henry II of England in 1152, Agenais became the possession of the English kings. It alternated between French and British rule until it was reunited to the French crown in 1615.