| pius ii | (n) Italian pope from 1458 to 1464 who is remembered for his unsuccessful attempt to lead a crusade against the Turks (1405-1464), Syn. Enea Silvio Piccolomini, Aeneas Silvius |
| pius ix | (n) Italian pope from 1846 to 1878 who in 1854 declared the dogma of the Immaculate Conception of the Virgin Mary, Syn. Giovanni Mastai-Ferretti, Giovanni Maria Mastai-Ferretti |
| pius v | (n) Italian pope from 1566 to 1572 who led the reformation of the Roman Catholic Church; he excommunicated Elizabeth I (1504-1572), Syn. Antonio Ghislieri |
| pius vi | (n) Italian pope from 1775 to 1799 who served during the French Revolution; Napoleon attacked the Papal States and in 1797 Pius VI was taken to France where he died (1717-1799), Syn. Giannangelo Braschi, Giovanni Angelo Braschi |
| pius vii | (n) Italian pope from 1800 to 1823 who was humiliated by Napoleon and taken prisoner in 1809; he concluded a concordat with Napoleon and crowned him emperor of France; he returned to Rome in 1814 (1740-1823), Syn. Luigi Barnaba Gregorio Chiaramonti, Barnaba Chiaramonti |
| pius x | (n) pope who condemned religious modernism; he was canonized in 1954 because of his interest in the poor (1835-1914), Syn. Giuseppe Sarto, Giuseppe Melchiorre Sarto |
| pius xi | (n) pope who signed a treaty with Mussolini recognizing the Vatican City as an independent state (1857-1939), Syn. Achille Ratti, Ambrogio Damiano Achille Ratti |
| pius xii | (n) pope who maintained neutrality during World War II and was later criticized for not aiding the Jews who were persecuted by Hitler (1876-1958), Syn. Eugenio Pacelli |
