He was the son of John Plunkett, 3rd Baron of Dunsany, and Catherine Hussey, daughter of the feudal baron of Galtrim.
Plunkett's remains were taken to Sydney and buried in the old Devonshire Street cemetery, beside those of Archpriest John Joseph Therry and Archdeacon McEncroe.
In 1474 he was a founder member of the Brotherhood of Saint George, a short-lived military guild which was charged with the defence of the Pale (the part of Ireland under secure English control), and which was for some years the only English standing army in Ireland.
Supported by the Attorney General, John Plunkett, Gipps ordered Police Magistrate, Edward Denny Day at Muswellbrook, to investigate the massacre.
Drax is the grandson of Adm The Hon Sir Reginald Drax, the younger son of the 17th Baron of Dunsany and he is also the grandson of Lt Gen The Lord Weeks and is now Conservative MP for South Dorset.
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His older brother was the 17th Baron of Dunsany and his cousin was George, 1st Count Plunkett, a Papal count and father of Joseph Mary Plunkett.