With evidence of human occupation from the Late Preclassic Period until the Conquest –around 1540 A.D.- covered 19 sq. km. and is believed to have been inhabited by 40,000 people. Kalom ‘Uk’ Uw Chan Chaak, ruler of Chi’y Chaan Ti’ Ho (Dzibilchaltun’s original name), at the end of 800 A.D. or beginning of 900.