Cortés had Atahualpa executed by garrote after obtaining what he wanted.

“do that because bear in mind the deal was if he provided cortez and he walked into that room and said i can fill it up this high with with gold and silver and cosaro would promise to be released at that point perhaps he actually felt that this was a man of his word but cosaro in no case was and had him garroted to death after getting what he wanted so it may just be that he misinterpreted cosaro as someone who was on the same level that kings don't do this to other kings”