A vicar general (previously, archdeacon) is the principal deputy of the bishop of a diocese for the exercise of administrative authority and possesses the title of local ordinary. As vicar of the bishop, the vicar general exercises the bishop's ordinary executive power over the entire diocese and, thus, is the highest official in a diocese or other particular church after the diocesan bishop or his equivalent in canon law. The title normally occurs only in Western Christian churches, such as the Latin Church of the Catholic Church and the Anglican Communion. Among the Eastern churches, the Mar Thoma Syrian Church of Kerala uses this title and remains an exception. The title for the equivalent officer in the Eastern churches is syncellus and protosyncellus.