Other structures include the High Priest’s Grave and the Colonnade (Thousand Columns) and the adjoining Temple of the Warriors. Most of these buildings probably were completed in the Early Post-Classic Period (c. 900–1200). In the Late Post-Classic Period (c. 1200–1540), Chichén appears to have been eclipsed by the rise of the city of Mayapán. For a time Chichén Itzá joined Uxmal and Mayapán in a political confederacy known as the League of Mayapá