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The region under a bishop's control is called a diocese.
A "dioceses" is a section of land that the bishop presides over.
The leader of a diocese is a Bishop.However if the territory becomes larger and he is now in charge of more dioceses with more responsibilities,then he is an Archbishop.
A bishop's staff is called a crosier.
The crozier is the staff used by a bishop.
Emertius Bishop or Laid Bishop
A "dioceses" is a section of land that the bishop presides over.
The bishop's headdress is called a mitre.
It is called just that, a Mass of Installation of a new bishop. It is conducted by another bishop or bishops. It is distinct from a later ceremony when the newly installed bishop 'takes possession' of his cathedral.
Cathedral. The Cathedra is, in effect the Bishop"s seat or throne. Normally a Bishop is the chief ecclesiastical officer of a major city or community=-a diocese, Bishopric ( rarely used in US) or Archdiocese. Bishops correspond to Mayoral level officials- if the Cardinals are the (general staff).
The territory of a Caliph is called a Caliphate.
.Catholic AnswerThe chief bishop is called the Pope, the Holy Father, the Pontiff, etc.