 The diocese corresponds to the department of Morbihan, and is suffragan to the Archdiocese of Rennes, Dol, and Saint-Malo.Raymond Michel René Centène is the current bishop since his appointment in 2005.In 1801, the diocese was expanded after the Concordat of 1802, to include part of the ancient Diocese of Saint-Malo, which was subsequently suppressed, after a three way split among the Dioceses of Vannes and Saint-Brieuc and the Archdiocese of Rennes.