All the dioceses of England and Wales were subdivided into archdeaconries, a group of parishes under the jurisdiction of an archdeacon, though some dioceses (Oxford for example) contained only a single archdeaconry. Archdeaconry is also used in CCEd as the definition of a grouping of locations to assist with searches. In this context the archdeaconry provides the sub-diocesan jurisdiction within which the location was found, and in almost all cases it is the same as the historic archdeaconry of the same name.