When her father was murdered in 1941, she inherited the earldom of Erroll and the lordship of Hay, while the barony of Kilmarnock had passed to her uncle, Gilbert Boyd, 6th Baron Kilmarnock.
He was Lieut-Colonel off the Angus regiment and he married Anne daughter of Colonel George Hay grandfather of Andrew 11th Earl of Erroll and a noted Royalist.
A letter sent to enlist the help of George Hay, Earl of Erroll, Hereditary Constable of Scotland, written 24 January 1560 focussed on their secular goal to expel the French garrisons and justifies their request for English military support.
James Earl Jones | Prince Edward, Earl of Wessex | Louis Mountbatten, 1st Earl Mountbatten of Burma | Herbert Kitchener, 1st Earl Kitchener | Earl | Frederick Roberts, 1st Earl Roberts | Earl of Derby | Earl Warren | Earl of Pembroke | Robert Harley, 1st Earl of Oxford and Earl Mortimer | Earl of Warwick | Thomas Wentworth, 1st Earl of Strafford | Edward Smith-Stanley, 14th Earl of Derby | Earl of Shrewsbury | William Pitt, 1st Earl of Chatham | Simon de Montfort, 6th Earl of Leicester | Richard Neville, 16th Earl of Warwick | Earl of Leicester | John Scott, 1st Earl of Eldon | Robert Devereux, 2nd Earl of Essex | Robert, 1st Earl of Gloucester | Edward Harley, 2nd Earl of Oxford and Earl Mortimer | Earl of Devon | Douglas Haig, 1st Earl Haig | My Name Is Earl | Edward Hyde, 1st Earl of Clarendon | Earl Scruggs | Earl of March | Richard Howe, 1st Earl Howe | John Russell, 1st Earl Russell |
His heraldic career began in 1978 when he was appointed Slains Pursuivant of Arms to the Chief of the Name and Arms of Hay, the Earl of Erroll, Lord High Constable of Scotland.
Victor Alexander Sereld Hay, 21st Earl of Erroll and 4th Baron Kilmarnock, KCMG (17 October 1876 – 20 February 1928), was a British diplomat and briefly a member of the House of Lords.
William George Hay, 18th Earl of Erroll KT, GCH, PC (21 February 1801 – 19 April 1846), styled Lord Hay between 1815 and 1819, was a Scottish peer and politician.