 The structure was built by Uaxaclajuun Ub'aah K'awiil and K'ak' Yipyaj Chan K'awiil, the 13th and 15th rulers in the dynastic succession.The wide Hieroglyphic Stairway ascends the building on the west side from the courtyard below.The earliest version of the temple, nicknamed Yax, was built during the reign of K'inich Yax K'uk' Mo', the dynastic founder, and has architectural features (such as inset corners) that are characteristic of Tikal and the central Petén region.