History of the Papacy, Papal regalia & insignia, Saint Peter, Holy See, Papal conclave, Primacy of the Roman Pontiff, Pope Gregory I, Pope John Paul I, Early life of Pope John Paul II, Teachings of Pope John Paul II, 1981 Pope John Paul II assassination attempt, Pope Leo I, Papal conclave 1799 1800, Pope Alexander VI, Pope Julius II, Papal conclave 2005, Early life of Pope Benedict XVI-Background, Pope Benedict XVI Islam controversy