Major John Alexander Moncreiffe was born on 2 August 1871.3 He was the son of Sir Thomas Moncreiffe of that Ilk, 7th Bt. and Lady Louisa Hay-Drummond.1,2 He married Lady Beatrice Constance Grosvenor, daughter of Hugh Lupus Grosvenor, 1st Duke of Westminster and Lady Constance Gertrude Leveson-Gower, on 4 October 1910 at St. Peter's Church, Eaton Square, London, England.4 He died on 21 June 1933 at age 61 at Boughton Park, Northamptonshire, England, from heart failure, without issue.4 Major John Alexander Moncreiffe was educated at Harrow School, Harrow on the Hill, London, England.3 He gained the rank of Lieutenant in the service of the 4th Battalion, Worcestershire Regiment.4 He was decorated with the award of Military Cross (M.C.).1 He fought in the Boer War, where he was severely wounded.3 He gained the rank of Lieutenant in 1902 in the service of the Younghusband's Horse.2 He fought in the First World War, where he was mentioned in desptaches and was wounded.2 He gained the rank of Major in the service of the Oxfordshire Hussars.3 He was commanding officer of the Cavalry Machine Gun Squadrons.2 He was decorated with the award of Croix de Guerre (avec palmes).2 He was decorated with the award of Distinguished Conduct Medal (D.C.M.).3