Builders at the site expected they would find historic objects during construction. Before it became a parking lot (coincidentally, once used by the University of Edinburgh's archaeology department), the site housed the 17th-century Royal High School, the 16th-century Old High School, and the 13th-century Blackfriars Monastery, researchers said. Archaeologists also apparently uncovered some medieval remains of the monastery, which had been destroyed and somewhat lost since the Protestant Reformation in the 16th century.