Pope Leo X, who was pope from March 9, 1513, to December 1, 1521, excommunicated Luther.
The pope and several Roman Catholic monarchs.
The RC Church treated him as a heritic and his life was threatened.
Martin Luther was never made a representative of the pope.
Martin Luther King did not challenge the pope.
The Pope issued a papal bull threatening to excommunicate Luther if he did not recant in 90 days. Luther is said to have burned copies of the bull. Luther was excommunicated and Holy Roman Emperor Charles V was told to kill him on charges of heresy. Charles summoned him to Worms (verms) to be examined. Luther was declared a heretic. Luther had thirty days to return home before being declared an outlaw. On the way back to Wittenburg Luther was kidnapped by his friend a prince of Germany. the prince took him to a castle where luther lived in safety and translated the New Testament into German. Because Charles was busy with foreign affairs Luther was not bothered for the remainder of his life which he spent mostly in Wittenburg.
Martin Luther stated he would only reconcile with the Pope if the Pope accepted his 95 Theses in their entirety. On meeting with the Pope, the Pope accepted only a fraction of them which caused Martin Luther to break with the Communion of Rome.
Pope John XIIII declared the 2000 Jubilee Year.
The pope excommunicated Luther because his teachings were heretical.
Pope Julius I
He was not a threat at all to the pope
Pope John Paul II declared Juan Diego a saint.
Martin Luther, professor of biblical studies and Augustine monk, initially sought to reform in the use of indulgences. In response, Prierias, Master of the Papal Palace, declared any challenge to the sale of indulgences heretical. Luther proceeded to deny the infallibility of the pope and of General Councils, for which the pope excommunicated him in 1520. However, the Elector of Saxony declined to enforce the Bull of Excommunication, which Luther publicly burnt in the university at Wittenberg. One of the forty one heresies and "pestiferous errors" of which he was accused was the opinion that "the burning of heretics is against the will of the Holy Spirit."