Another in 1455 by Nicholas V[2] praising Catholic King Afonso V of Portugal for his battles against the Muslims, endorsing his military expeditions into Western Africa and instructing him to capture and subdue all Saracens, Turks, and other non-Christians to reduce their persons to perpetual slavery. The Church leaders argued that slavery served as a natural deterrent and Christianizing influence to “barbarous” behavior among pagans.[3][4] As a follow-up to the bull Dum Diversas, the church leaders now took positions aside the Crown of Portugal that it was entitled to dominion over all lands south of Cape Bojador in Africa. The bull's primary purpose was to forbid other Christian kings from infringing the King of Portugal's practice of trade and colonisation in these regions, particularly amid the Portuguese and Castilian competition for ascendancy over new lands discovered.[5]
^"Popes, The". www.jewishencyclopedia.com. Archived from the original on 2011-10-14. Retrieved 2020-04-11.
^Miller, Robert J.; Ruru, Jacinta; Behrendt, Larissa; Lindberg, Tracey (2010). Discovering Indigenous Lands: The Doctrine of Discovery in the English Colonies. OUP Oxford. p. 11. ISBN978-0199579815. This bull was issued several times in the fifteenth century by several popes.
^Tomlins, Christopher (2010). Freedom Bound: Law, Labor, and Civic Identity in Colonizing English America, 1580–1865. New York: Cambridge University Press. p. 101. ISBN978-0521761390.