was Bartolome de las Casas who claimed that native people were advanced civilizations, and Spain could not justify their enslavement or force conversion to such a hospitable and kind people. Las casas even went as far as engaging in a debate, held in the Valladolid, against Gines de Sepulveda. In doing so, he was able to momentary obstruct the persistence of the Encomienda. Another Spaniard to speak out in defense of the natives was missioner Antonio Montesinos. In a sermon given by Montesinos in