Pope Urban VI, born Bartolomeo Prignano in 1318, became the head of the Roman Catholic Church in 1378. His election followed the papacy of Pope Gregory XI, and he was the first pope to reside in Rome after the Avignon Papacy. Urban VI is known for his reformist zeal and efforts to address corruption within the Church. His papacy was marked by controversy, leading to the Western Schism, where rival popes emerged. Urban VI's harsh leadership style alienated many cardinals, resulting in the election of Antipope Clement VII in 1378. This division created a significant crisis in the Church that lasted for decades.