sentences:  Archaeological investigations indicate that the earliest, Middle Preclassic, settlement was in what developed into the southern and western sectors of the city.In the Late Preclassic the city became the largest settlement in the Yaxha-Sacnab basin, with a marked increase in population and in construction activity.The city reached the height of its power during the Early Classic period of Mesoamerican chronology (c. AD 250–600), during which period the city expanded enormously.