History of the papacy (1048–1257) Pope Urban II (1088–99) speech at the Council of Clermont in 1095 became the rallying cry of the First Crusade. Unlike the previous millennium, the process for papal selection became somewhat fixed during this period. Pope Nicholas II promulgated "In Nomine Domini" in 1059, which limited suffrage in papal elections to the College of Cardinals. The rules and procedures of papal elections evolved during this period, laying the groundwork for the modern papal conclave. The driving force behind these reforms was Cardinal Hildebrand, who later became Gregory VII. The Investiture Controversy was the most significant conflict between secular and religious
Pope Urban I Pope Urban I Pope Urban I () was Bishop of Rome or Pope from 222 to 23 May 230. He was born in Rome and succeeded Pope Callixtus I, who had been martyred. It was previously believed for centuries that Urban I was also martyred. However, recent historical discoveries now lead scholars to believe that he died of natural causes. Much of Urban's life is shrouded in mystery, leading to many myths and misconceptions. Despite the lack of sources he is the first Pope whose reign can be definitely dated. Two prominent sources do exist for Urban's pontificate: Eusebius' history