The Roman Catholic Church is the primary Catholic church, and the largest single denomination of Christianity. The Church is headed by the Pope, currently Pope Francis I, who lives in the Vatican City. Roman Catholicism dates back to the days of Saint Peter in the 1st century AD. Roman Catholicism split with the Eastern Orthodox Church in the Great Schism of 1054, and lost many followers during the Protestant Reformation. Today, the Roman Catholic Church is the dominant religious force in Southern Europe, Latin America, and parts of Africa and Asia.