Page:The ecclesiastical architecture of Scotland ( Volume 3).djvu/189

 there was a residence here, and the chapel may have served both as sacristy and private chapel.

This chapel or sacristy is supposed to have been built in the lifetime of Sir William St. Clair's first wife, Lady Elizabeth or Margaret Douglas, daughter of Archibald, fourth Earl of Douglass, and first Duke of Touraine, from the circumstance that her arms (Fig. 1088) are sculptured on the east wall. The shield has two coats impaled: Dexter, a coat quarterly, dimidiated, viz.—First a galley within a double tressure, flory counter

—The Collegiate Church of Rosslyn. Caps of Openings to Choir.

flory, for Orkney; 3rd a cross engrailed for St. Clair, being the 1st and 3rd quarters of the arms of the Earl of Orkney; Sinister, in base a heart, and on a chief three mullets, for Douglas, the shield being surmounted of a fess charged with three fleurs-de-lys (2 and 1) for Touraine. Lady Elizabeth died in 1452.

The barrel vault of the sacristy (see Fig. 1087) is semicircular, and supports a flat roof formed with overlapping stones. The vault is strengthened with transverse ribs carved with the engrailed cross, which spring from corbels sculptured with figures of angels and saints (Fig. 1089).