Iain Moncreiffe (1919–1985)

Sir Rupert Iain Kay Moncreiffe of that Ilk, 11th Baronet, CVO, QC 9 April 1919 – 27 February 1985 was a British officer of arms and genealogist.
The son of Lieutenant-Commander Gerald Moncreiffe, RN, and Hilda, daughter of the Comte de Miremont, he succeeded his cousin as 11th Baronet in 1957. The baronetcy derived from the feudal barony of Moncreiffe, near Perth, Scotland. "Of that Ilk" means "of that same place", i.e. it is a contraction of "Moncreiffe of Moncreiffe" a common mistake is to assume it means "with the same name" or "of the same type".
Educated at Stowe School, Heidelberg, and Christ Church, Oxford, he served in World War II in the Scots Guards, served as attaché at the British embassy in Moscow, and then studied Scots Law at the University of Edinburgh, where he took a Ph.D. with a thesis on the Scots law of succession to peerages.
A prominent member of the Lyon Court, he held the offices of Falkland Pursuivant 1952, Kintyre Pursuivant 1953, Unicorn Pursuivant 1955, and from 1961 Albany Herald. He wrote a popular work about the Scottish clans, The Highland Clans 1967, and Simple Heraldry, Cheerfully Illustrated 1953 with Don Pottinger, but his interests also extended to Georgian and Byzantine noble genealogies. Lord of the Dance, A Moncreiffe Miscellany, edited by Hugh Montgomery-Massingberd encompassed his genealogical world-view.
A self-confessed incorrigible snob, he took silk relatively late in his career, because very few barristers specialised in heraldic matters and he wished to highlight the importance of this field of speciality. He was a frequent writer of amusing and often illuminating letters to newspapers, particularly The Daily Telegraph. He held membership in many London clubs and founded his own club in Edinburgh, called Puffin's, after his first wife, Diana Hay, 23rd Countess of Erroll, whom he married in 1946. He and his wife were one of the few couples to both hold titles in their own right. They had three children:

Merlin Sereld Victor Gilbert Hay, 24th Earl of Erroll born 20 April 1948Hon. Peregrine David Euan Malcolm Moncreiffe of that Ilk, Chief of Clan Moncreiffe born 16 February 1951Lady Alexandra Victoria Caroline Anne Hay born 30 July 1955That marriage was dissolved in 1964 and in 1966 he took as his second wife Hermione Patricia Faulkner, daughter of Lieutenant-Colonel Walter Douglas Faulkner by his wife the present Dowager Countess of Dundee.