 The School of Salamanca, which gathered theologians such as Francisco de Vitoria (1480–1546) or Francisco Suárez (1548–1617), argued in favor of the existence of natural law, which thus gave some rights to indigenous people.However, while the School of Salamanca limited Charles V's imperial powers over colonized people, they also legitimized the conquest, defining the conditions of "Just War".For example, these theologians admitted the existence of the right for indigenous people to reject religious conversion, which was a novelty for Western philosophical thought.