Around the 13th century, Group A underwent a major remodelling, including the construction of a new retaining wall and the infilling of the wide area between the old and new walls, creating a much expanded terrace for the construction of the group's architecture. Owing to its possession of two ballcourts, it is possible that Jilotepeque Viejo served as a regional centre for the Mesoamerican ballgame during the Postclassic; no other Postclassic ballcourt has been identified in the area of San Martín Jilotepeque although three of four Classic period ballcourts at other sites appear to have continued in use. Shortly before the Spanish Conquest, the Chajoma under their lord Achi Q'alel rebelled against the Kaqchikels of Iximche.