The Diocese of Bayeux and Lisieux (Latin: Dioecesis Baiocensis et Lexoviensis; French: Diocèse de Bayeux et Lisieux) is a Latin Church diocese of the Catholic Church in France. It is coextensive with the Department of Calvados and is a suffragan to the Archdiocese of Rouen, also in Normandy.
With the Concordat of 1802, the former Diocese of Lisieux was merged with that of Bayeux. A pontifical brief in 1854 authorized the Bishop of Bayeux to call himself Bishop of Bayeux and Lisieux.
Bayeux Cathedral, also known as Cathedral of Our Lady of Bayeux (French: Cathédrale Notre-Dame de Bayeux), is a Roman Catholic church located in the town of Bayeux in Normandy, France. A national monument, it is the seat of the Bishop of Bayeux and Lisieux and was probably the original home of the Bayeux Tapestry, still preserved nearby. The cathedral is in the Norman-Romanesque architectural tradition.
The site is an ancient one and was once occupied by Roman sanctuaries. The present cathedral was consecrated on 14 July 1077 in the presence of William, Duke of Normandy. It was on this site that William may have forced Harold Godwinson to take an oath of support to him, the breaking of which led to the Norman Conquest of England – meaning that the oath must have been made before 1066.