900-1200 CE
From 900 to 1200 CE, the Mayans endured the collapse of their classic civilization and built anew — the great cities of the Petén abandoned to the jungle, but Chichén Itzá and Uxmal rising in the Yucatán with new styles and new gods. Toltec warriors merged with Maya priests; the sacred cenote received its offerings; and the long count calendar that had measured cosmic ages fell silent, replaced by shorter cycles for a diminished age.