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What did Unam sanctam say was necessary for salvation?
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Boniface VIII
Miniature of Pope Boniface VIII from Vaticinia de Pontificibus (an index of prophecies of the popes), c. 14th century; in the British Library, London.
In the papal bull Unam sanctam (1302), Pope Boniface VIII asserted the supremacy of the spiritual power over the temporal power. Regarding the requirements for salvation, the document concludes with a dogmatic statement declaring that submission to the pope—as the holder of the papal plenitude of power—is necessary for every human creature.1