This drawing is from Alexander Brook’s 1892 article in PSAS, on the maces of the Scottish Universities. It is a drawing of two of the six heraldic shields on St Andrews Arts faculty mace.
The one on the right, no. IV, shows the arms of Alexander Stewart, Earl of Mar (c.1375-1435). I don’t know what his connection is with the University of St Andrews, though he witnessed a royal confirmation of the University’s charter in 1432. The University started in 1411; the shield was presumably made and affixed to the mace on its completion in about 1416.
The Earl of Mar led the Royalist army at the Battle of Harlaw in 1411. It is fascinating to me to trace these connections. I will point out this coincidence in my concert on Sunday, when I will play the ceòl mór variation set of Cath Gairbheach (the Battle of Harlaw). Unfortunately the side of the Arts Faculty mace that has Mar’s shield is facing away from the centre of the exhibition room, but you can see it OK if you go round the other side of the case.