the Reformation and the Counter-Reformation included the rise of the printing press, nationalism, simony, the appointment of Cardinal-nephews, and other corruption of the Roman Curia and other ecclesiastical hierarchy, the impact of humanism, the new learning of the Renaissance versus scholasticism, and the Western Schism that eroded loyalty to the Papacy. Unrest due to the Great Schism of Western Christianity (1378–1416) excited wars between princes, uprisings among the peasants, and widespread concern over corruption in the Church, especially from John Wycliffe at Oxford University and from Jan Hus at the Charles University in Prague. Hus objected to some of the practices of the Roman Catholic Church and wanted to return the church in Bohemia and Moravia to earlier practices: liturgy in the language of the people (i.e. Czech), having lay people receive communion in both kinds (bread and wine—that is, in Latin, communio sub utraque specie), married priests, and eliminating indulgences and the concept of purgatory. Some of these, like the use of local language as the liturgical language, were approved by the pope as early as in the 9th century. The leaders of the Roman Catholic Church condemned him at the Council of Constance (1414–1417) and he was burnt at the stake, despite a promise of safe-conduct. Wycliffe was posthumously condemned as a heretic and his corpse exhumed and burned in 1428. The Council of Constance confirmed and strengthened the traditional medieval conception of church and empire. The council did not address the national tensions or the theological tensions stirred up during the previous century and could not prevent schism and the Hussite Wars in Bohemia. Pope Sixtus IV (1471–1484) established the practice of selling indulgences to be applied to the dead, thereby establishing a new stream of revenue with agents across Europe. Pope Alexander VI (1492–1503) was one of the most controversial of the Renaissance popes. He was the father of seven children, including Lucrezia and Cesare Borgia. In response to papal corruption, particularly the sale of indulgences, Luther wrote The Ninety-Five Theses. A number of theologians in the Holy Roman Empire preached reformation ideas in the 1510s, shortly before or simultaneously with Luther, including Christoph Schappeler in Memmingen (as early as 1513). Magisterial Reformation The Reformation is usually dated to 31 October 1517 in Wittenberg, Saxony, when Luther sent his Ninety-Five Theses on the Power and Efficacy of Indulgences to the Archbishop of Mainz. The theses debated