In church governance, a diocese or bishopric is the ecclesiastical district under the jurisdiction of a bishop.
Like other dioceses, the Diocese of Rome has a cathedra, the official seat of the Bishop of Rome.
St Patrick's Cathedral, the seat of the Anglican Diocese of Armagh in the Church of Ireland
Ecclesiastical polity is the government of a church. There are local (congregational) forms of organization as well as denominational. A church's polity may describe its ministerial offices or an authority structure between churches. Polity relates closely to ecclesiology, the theological study of the church.
The apostles Peter and John laying hands in ordination. Illustration, 1873.
An Anglican deacon, bishop and priest. Priests are usually former deacons in episcopal polity.
The ordination of Methodist Bishop Francis Asbury, 1784.
Cathedral churches like St. Andrews were incompatible with the presbyterian polity taught by John Knox. This statue stands in St. Giles, still called a cathedral despite no longer serving as an episcopal seat.