Nicholas V, 1397–1455, pope (1447–55), an Italian named Tommaso Parentucelli, b. probably Sarzana, Liguria; successor of Eugene IV. From Eugene IV he inherited the antipapal enactments of the Council of Basel (see Basel, Council of ). By a conciliatory policy Nicholas gained the Concordat of Vienna (1448) with Holy Roman Emperor Frederick III . It undid much of the damage to papal authority, and the following year the council and the antipope, Felix V, submitted to Nicholas. In 1450 a splendid jubilee marked the schism's end. To further church reform, the pope sent (1450) Nicholas of Cusa to Germany. Pope Nicholas was renowned for learning and piety; he established the papacy as a patron of the humanities and was a founder of the Vatican Library. Lorenzo Valla benefited from his generosity. A plot on his life and the fall (1453) of Constantinople to the Ottoman Turks clouded his last days. He was succeeded by Calixtus III.
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