In 1441, Ah Xiu Xupan, who was the great ruler of Uxmal at that time, was given the task of starting a war with the royal family of Cocom, which founded Tibolón.[1] He managed to kill everyone except for one Cocom survivor. The war between Uxmal and Cocom plunged the league into chaos; there was segregation in the provinces and several uprisings broke out. By 1461, the league was completely disintegrated.