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Published by Nicolaus van Aelst | Portrait of Sixtus V | The Metropolitan Museum of Art
Sixtus IV | pope | Britannica
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File:7-St.Sixtus I.jpg - Wikimedia Commons
Sixtus | wein.plus Lexicon
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SIXTUS IV, THE POPE OF THE "RENOVATIO URBIS"
File:Portrait of Pope Sixtus V.jpg - Wikimedia Commons
