 He is known as the metropolitan archbishop of that see.In the Catholic Church, canon 436 of the Code of Canon Law indicates what these powers and duties are for a Latin Church metropolitan archbishop, while those of the head of an autonomous ("sui iuris") Eastern Catholic Churches are indicated in canon 157 of the Code of Canons of the Eastern Churches.All Catholic metropolitans are archbishops, but not all archbishops are metropolitans, though most are.