Aeterni regis
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The Papal Bull Aeterni regis was issued on 21 June 1481 by Pope Sixtus IV, simply confirmed the substance of the Treaty of Alcáçovas, thereby reiterating that treaty's confirmation of Castile in its possession of the Canary Islands and its granting of all further acquisitions made by Christian powers in Africa (and eastward to the Indies) to Portugal.
