William Edward Peter Louis Drummond-Murray of Mastrick (born 24 November 1929)[1] is the Slains Pursuivant of Arms to the Chief of the Name and Arms of Hay — the Earl of Erroll, Lord High Constable of Scotland. Drummond-Murray of Mastrick is a retired banker and an authority on heraldry who continues to publish on that subject. He was appointed to the office in 1982.