sentences:  The smallpox plague arrived around 1519 or 1520, preceding by several years the first Europeans to visit the region.Hernán Cortés led the first expedition to pass through the Petén Basin, in 1524 to 1525, and reported that the region mostly had small hamlets separated by thick forest, with Tayasal being the only sizable inhabited city they observed.After Cortés' expedition, the colonial Spanish largely tried to conquer Petén Basin, with several attempts mainly from Belize and Alta Verapaz, for generations until an expedition from Yucatán, Belize and Cobán in Alta Verapaz, succeeded in conquering the last independent Maya polities around 1697, such as Zacpeten (capital of the Kowoj Maya), the Itza Maya center of Tayasal, and other towns in the Lake Petén Itza region such as Quexil (modern Spanish name, in Maya