David I founded this abbey in the shadow of Salisbury Crags in 1128. It was probably named after a fragment of the True Cross (rood is an old Scots word for cross), said to have been brought to Scotland by David's mother, St Margaret. Most of the ruins date from the 12th and 13th centuries, although a doorway in the far-southeastern corner has survived from the original Norman church. Admission is included in the cost of a Palace of Holyroodhouse ticket.