 A Junta of Burgos (1513) declared that Charles V had a sound title to the Indies. One argument in that context, grounded in Aristotle’s thought, was that the Amerindians were slaves by nature. This view did not remain uncontested; and, eventually, on June 2, 1537, Pope Paul III, influenced by Las Casas, issued the bull Sublimis Deus, declaring the indigenous peoples to be fully human with souls and just title to their possessions. The ongoing debate climaxed in the disputation between Las Casas, defending the liberty of the indigenous populations, and the humanist Aristotelian Juan Ginés de Sepúlveda (1494–1573), who defended the Spanish title to the Indies because of the Amerindian’s sins and because they were slaves by nature. This took place in the Junta of Valladolid (1550/51), which Charles V had assembled with a number of other leading scholars on both sides.