 Harcourt akaberekerwa muOxfordshire, mwanakomana waHonourable Simon Harcourt, M.P. weWallingford neAbingdon, naElizabeth Evelyn, hanzvadzi yaSir John Evelyn, 1st Baronet. Baba vake vakafa muna 1720, apo Simon akanga achiri mwana muduku. Akadzidza paWestminster School uye muna 1727 akatsiva sekuru vake Simon Harcourt, 1st Viscount Harcourt sa 2nd Viscount Harcourt. Muna 1745, pashure pokunge amutsa boka revarwi kuti rishande panguva yeMupanduki wevaJacobite, 76th Foot Lord Harcourts Regiment, akagamuchira komisheni sa colonel muuto. Chiremera chakaparadzwa musi wa 10 Chikumi 1746. 