Magellan’s abortive attempts to introduce baptism among the natives of the island of Cebu during the month of April of 1521 and the more successful efforts of the Spanish missionaries to preach the Gospel following the arrival of the Legazpi-Urdaneta expedition at Cebu on February 13, 1565 occurred during the initial and the culminating chapters respectively of the “spiritual conquest” of those native peoples of America and the Far East who were to enter the orbit of Spanish culture. During April of 1521, as Magellan was transforming himself into a lay missionary, Hernán Cortés was making the final preparations for the siege of Tenochtitlán. Its successful issue on August 13, 1521 laid the foundation not only of the Spanish Empire in the New World, but also it provided the Spaniards with the base of operations from which eventually they could extend their power to the Philippines. It was Cortés’ conquest of the Aztec Confederation in 1521 which enabled the Catholic missionaries of Spain to undertake one of the most extensive expansions in the history of the Christian Church. In 1565 the Spanish Church for its Philippine enterprise was able to draw upon a vast storehouse of missionary experience acquired in both North and South America. Magellan’s apostolic labors, ill-starred and brief though they were, exemplify many of the permanent features of the Spanish missionary enterprise. The Magellan episode also illustrates how his successors after 1565 did in fact profit from the Circumnavigator’s errors of judgment and tactics.