Suffragan Diocese

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In the Catholic Church, an archbishop or metropolitan, is a bishop who governs a diocese strictly his own, while he presides at the same time over the bishops of a well-defined district composed of simple dioceses but not of provinces. These bishops are called the suffragans. The archbishop's own diocese is the archdiocese. The several dioceses of the district form the metropolitan province and are suffragan dioceses of the archdiocese.

Source: "Catholic Encyclopedia"