On this day, May 20, 1520, after initially granting Montezuma permission to celebrate the Festival of Tóxcatl, Pedro de Alvarado later interrupted the celebration, killing almost everyone present at the festival, men, women, and children alike. The few who managed to escape the massacre climbing over the walls and spread word of the atrocity. Aztecs histories say that the conquistadors began the massacre when they saw the amount of gold used in the rituals. In the Spanish account, the conquistadors intervened to stop a human ritual sacrifice. In either case, the result was a negative turn in Aztec-Spanish relations.