| PIU | pope remembered for his unsuccessful attempt to lead a crusade against the Turks (1405-1464) |
|---|---|
| PIU | pope who led the reformation of the Roman Catholic Church |
| PIU | pope who concluded a concordat with Napoleon and crowned him emperor of France (1740-1823) |
| PIU | pope who condemned religious modernism (1835-1914) |
| PIU | pope who signed a treaty with Mussolini recognizing the Vatican City as an independent state (1857-1939) |
| PIU | pope who maintained neutrality during World War II and was later criticized for not aiding the European Jews (1876-1958) |
| PIU | a member of either of two Shoshonean peoples (Northern Paiute and Southern Paiute) related to the Aztecs and living in southwestern United States |