In 1142 de Harcourt was named Bishop of Bayeux, an office he held until 1163.

On August 3, 1498, he was elected Bishop of Bayeux.

It is the seat of the Bishop of Bayeux.

Its domesday assets were owned by the Bishop of Bayeux.

The Domesday book recorded that this manor was under the ownership of the Bishop of Bayeux.

His elder brother François was Bishop of Bayeux.

Thomas' brother Richard became Bishop of Bayeux in about 1108 until Richard's death in 1133.

His illegitimate half-brother Richard was Bishop of Bayeux from 1135 to 1142.

It was held by Richard from the Bishop of Bayeux.

Other ladies joined them, and, in 1651, the Bishop of Bayeux gave the institute his approbation.