Moreover we command you in virtue of holy obedience that, employing all due diligence in the premises, as you also promise—nor do we doubt your compliance therein in accordance with your loyalty and royal greatness of spirit—you should appoint to the aforesaid mainlands and islands worthy, God-fearing, learned, skilled, and expeienced men, in order to instruct the aforesaid inhabitants and residents in the Catholic faith and train them in good morals.
In the document written by Pope Alexander IV it basically gave power to the crusaders to pillage and destroy indigenous lands, it gave them power to restrain indigenous people and force them to convert.