 It was however often ignored in practice, as the new colonies needed skilled people.At the end of the Renaissance, the Valladolid debate (1550–1551), concerning the treatment of the natives of the "New World" pitted the Dominican friar and Bishop of Chiapas, Bartolomé de Las Casas, to another Dominican and Humanist philosopher, Juan Ginés de Sepúlveda.The latter argued that the Indians practiced human sacrifice of innocents, cannibalism, and other such "crimes against nature"; they were unacceptable and should be suppressed by any means possible including war, thus reducing them to slavery or serfdom was in accordance with Catholic theology and natural law.