The Church of Saint George was carved downwards from a type of volcanic tuff. This is the sole architectural material that was used in the structure. It has been dated to the late 12th or early 13th century AD, and thought to have been constructed during the reign of King Gebre Mesqel Lalibela, of the late Zagwe dynasty.

Source: “Eighth Wonder Of The World”: The Sacred Orthodox Rock Church Of Saint George In Lalibela, Ethiopia