He was educated at Christ Church, Oxford from 1784, and later became a D.C.L. (1793). He also served as Colonel of the Kilkenny Militia.[1] He succeeded to his father's titles on the death of his father on 20 August 1794. Before the Act of Union, he was Chairman of Committees in the Irish House of Lords; as compensation from the abolition of the House in 1801, he was awarded an annual pension of £1332.[2]
At the coronation of George IV on 19 July 1821, he carried the Standard of Hanover.[4]
Family
On 24 May 1792, Mayo had married Arabella Mackworth-Praed (1766–1843), daughter of William Mackworth Praed of Bitton House, Devon; they had no children. Arabella was Lady of the Bedchamber to Queen Adelaide.[5] He died at Bersted Lodge, South Bersted, Sussex, the home of Susan Smith (née Mackworth-Praed) his sister in law and widow of Thomas Smith of Bersted Lodge (brother of Sir John Smith Burgess, Bart), and his titles passed to his nephew, Robert.[2][6]
A Cat-a-Mountain sejant guardant proper, collared and chained Or.
Escutcheon
Party per fess Or and Ermine, a cross gules the first quarter charged with a lion rampant sable and the second with a dexter hand couped at the wrist and erect gules
Supporters
On either side a Chevalier in complete Armour, holding in the exterior hand a Pole-Axe, all proper.[7][8]
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