The diocese initially included the Portuguese controlled or Christian areas of southwestern Africa.
In 1596, it lost territory to the new diocese of São Salvador do Congo (today's Angola).
In 1818 it lost territory to the new Apostolic Vicariate of Cape of Good Hope (today's South Africa).
In 1842 it lost territory to the new Apostolic Prefecture of the Two Guineas and Senegambia (much of central and west Africa).
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