Sixtus

Sixtus, name of 5 popes. Sixtus IV (1414–84) succeeded in 1471 and built the Sistine Chapel. His reign was characterized by nepotism and simony. Sixtus V (1521–90) succeeded in 1585 and brought the Papal States to order and made the pope one of Europe's richest princes. His reforms of church administration were part of the Counter-Reformation.