29 April 1997:   Stone vaulting over the nave along the south wall of the interior of Holyrood Abbey.  The abbey was founded in 1128 by Scottish King David I.

There are two different theories about the origin of the name "Holyrood."  One involves a vision of a cross by King Charles I and the other a remnant of the "True Cross" (the cross upon which Jesus was crucified) supposedly brought from Hungary to Scotland by St. Margaret after the Norman conquest of England in 1066.