The Kirkyard was involved in the history of the Covenanters. The Covenanting movement began with signing of the National Covenant in Greyfriars Kirk on 28 February 1638. Following the defeat of the militant Covenanters at Bothwell Brig in 1679, some 1200 Covenanters were imprisoned in a field to the south of the churchyard. When, in the 18th century, part of this field was amalgamated into the churchyard as vaulted tombs the area became known as the "Covenanters' Prison".