William Edward Peter Louis Drummond-Murray of Mastrick KStJ (24 November 1929 – 13 April 2014) was a Scottish herald, Private Officer of Arms, stockbroker and banker.

His mother, who was partly Spanish, was named after her godmother, the Infanta Eulalia of Spain;[1] her father was the third son of Joseph Robert Heaven (1840–1911), of the Forest of Birse,[3] Aberdeenshire, JP and wife Doña Maria Guadelupe Ramirez de Arellano y Braceras, 4th Marquesa de Braceras,[2] and her paternal uncle was Francis Joseph Heaven (1877–), Conde de Ramirez de Arellano,[2] Majordomo-in-waiting to King Alfonso XIII of Spain and Secret Chamberlain to Pope Leo XIII and to Pope Pius X,[2] and who bears his title (one of his mother's family titles) by Royal Spanish letters patent and enrolled in the papal nobility.

[4] He worked as a banker and a stockbroker, but his passion was heraldry and history, in particular, the Jacobites who numbered among his ancestors, including William Drummond, 4th Viscount Strathallan.

In 1982, the Lord High Constable of Scotland, Merlin Hay, 24th Earl of Erroll, appointed him as the Slains Pursuivant of Arms.

At the time of his death, he was working on a book to be called A Roll of Banners and Standards of the Order of St John in England.