Gascoigne is the elder son of Lieutenant-Colonel Derek Ernest Frederick Orby Gascoigne (himself the son of Brigadier-General Sir Ernest Frederick Orby Gascoigne) by his marriage in 1934 to Mary Louisa Hermione O'Neill, a daughter of Captain the Hon. Arthur Edward Bruce O'Neill and Lady Annabel Hungerford Crewe-Milnes.
His great-grandfathers include Robert Crewe-Milnes, 1st Marquess of Crewe, and Edward O'Neill, 2nd Baron O'Neill.[3] He is a nephew of Sir Julian Gascoigne who was in charge of the Household Division during the coronation of Queen Elizabeth II.[4]
He is a direct descendant of the 18th-century Lord Mayor of London Sir Crisp Gascoyne and the 19th century Tory politicians Bamber Gascoyne (the elder) and Isaac Gascoyne. Isaac's son General Ernest Frederick Gascoyne, of Raby Hall (1796–1867),[1] was his great-great-great-grandfather.[1]
― Cram Session in Goniometry (Tom D.), Sunday, 10 May 2015 11:59 (ten years ago)