Kavanagh, Member of the Irish House of Commons for Kilkenny, 1797-9, was a direct descendant of the ancient Catholic kings of Leinster, whose head was known as ‘The MacMorrough’ or ‘monarch’ in county Carlow. At an ‘early period in his life’ he entered the Austrian service, in which his uncle Field Marshal O’Kavanagh, governor of Prague, had been a ‘highly distinguished’ officer, and ‘served throughout the war’. Following the death of his last surviving elder brother in 1813 Kavanagh, an ‘unostentatious Christian’ who had evidently conformed to the established church, succeeded to the family’s ‘extensive’ estates in the counties of Carlow, Kilkenny and Wexford and so became ‘one of the largest landed proprietors in Ireland’.
Kavanagh, a lax attender, voted in the protectionist minority against the corn bill, 2 Apr. 1827. He presented a county Carlow petition for Catholic relief, 5 May, and divided thus, 12 May 1828. He denied that his constituents were ‘hostile to the Catholic claims’ and presented a Carlow petition in support of the Wellington ministry’s concession of emancipation, 9 Mar. 1829, but was absent from the divisions on the issue that month, having been predicted to vote ‘with government’ by the patronage secretary Planta. He presented constituency petitions against the Subletting and Vestry Acts, 9 Mar. 1829, and the assimilation of Irish and English newspaper stamp duties, 29 May, 23 June 1830. He was granted a month’s leave on account of ill health, 10 Mar., but was present to vote against reducing the grant for South African missions, 7 June. (His physician was highly recommended to the duke of Wellington by Lady Ormond that month.)
At the 1832 general election he stood unsuccessfully as a Conservative for county Carlow. He was returned in 1835, but the result was challenged on petition and subject to a lengthy inquiry, during which he reminded the new premier, Sir Robert Peel, ‘not to suffer to pass unnoticed and unremedied the outrageous practices of the Irish priests’, as ‘the result of future Irish elections will much materially depend on this being done’.
