Xunantunich is an Ancient Maya archaeological site in western Belize, about 70 miles west of Belize City, in the Cayo District. Xunantunich is located atop a ridge above the Mopan River, well within sight of the Guatemala border – which is 0.6 miles (1 km) to the west. It served as a Maya civic ceremonial centre to the Belize Valley region in the Late and Terminal Classic periods. At that time, when the region was at its peak, nearly 200,000 people lived in the Belize Valley.

Sir John Eric Sidney Thompson was a leading English Mesoamerican archaeologist, ethnohistorian, and epigrapher. While working in the United States, he dominated Maya studies and particularly the study of the Maya script until well into the 1960s.