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Pope Alexander VI (pictured) issued the papal bull Inter caetera, establishing a line of demarcation dividing the New World between Spain and Portugal.

Historical image related to Pope Alexander VI (pictured) issued the papal bull Inter caetera, establishing a line of demarcation dividing the New World between Spain and Portugal. from May 4, 1493

Pope Alexander VI

Bishop of Rome from 1492 to 1503

Pope Alexander VI was head of the Catholic Church and ruler of the Papal States from 11 August 1492 until his death in 1503.
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Papal bull

Type of decree by the Catholic pope

A papal bull is a type of public decree, letters patent, or charter issued by the pope of the Catholic Church. It is named after the leaden seal (bulla) traditionally appended to authenticate it.
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Inter caetera

1493 papal bull issued by Pope Alexander VI

Inter caetera was a papal bull issued by Pope Alexander VI on 4 May 1493, which granted to the Catholic Monarchs King Ferdinand II of Aragon and Queen Isabella I of Castile all lands to the "west and south" of a pole-to-pole line 100 leagues west and south of any of the islands…
Source: Wikipedia (CC BY-SA)