The Diocese of Sées is a Roman Catholic diocese located in the Normandy region of France. It was established in the 3rd century and is part of the ecclesiastical province of Rouen. The diocese covers a significant area and includes several towns and communities, with the city of Sées serving as its historical center. The diocese is known for its rich history and architectural heritage, including the Cathedral of Sées, which showcases Gothic and Romanesque styles. Over the centuries, the Diocese of Sées has played an important role in the religious and cultural life of the region, contributing to the development of the Catholic Church in France.