White, who saw action in the Peninsula and was awarded a medal with two clasps following the battles of Badajoz and Salamanca, was initially, like his brothers, brought forward for Parliament by his father Luke, a self-made man who had purchased a large estate near Dublin and gained a seat for Leitrim. Unexpectedly, when a vacancy arose for county Dublin in the winter of 1822 it was not his eldest brother and fellow militia officer Colonel Thomas White, who had fought contests there at the general elections of 1818 and 1820, nor his other brothers Samuel and Luke, who later represented Leitrim and Longford, but Henry who offered. Thomas was perceived to be ambivalent in his attitude to the Catholics, which may have been partly why he declined, but Henry, whose father was venerated locally, was considered their friend and rapidly gained popular support. In his address, 26 Dec. 1822, he exploited the recent Dublin theatre riot to emphasize his loyal but anti-Orange sentiments, and he moved the congratulatory address to the pro-Catholic lord lieutenant Lord Wellesley at a county meeting, 8 Jan. 1823. He claimed to be of no party on the hustings the following month, when he was enthusiastically endorsed by Daniel O’Connell*, and after a lengthy contest he triumphantly defeated his Tory opponent, despite the latter’s extensive territorial interest.
He voted to reduce taxes by £7,000,000, 28 Feb., and, unless it was his father, by £2,000,000, 3 Mar. 1823.
Dwelling on his former victory, White stood again with his like-minded colleague Richard Wogan Talbot at the general election of 1826, when he was returned with Catholic support after another fierce contest against a local Protestant Tory landlord; he survived a petition.
Although it was at one point rumoured that he might retire at the dissolution of 1830, his paternal and personal claims and the withdrawal of Talbot led to his being returned in second place with the Whig Lord Brabazon against one of his former challengers. He had received the tacit support of the Wellington administration, but distanced himself from it at the end of the contest and at his election dinner.
White divided for the second reading of the reintroduced reform bill, 6 July, at least twice against adjourning proceedings on it, 12 July 1831, and generally for its details. He was named to the Dublin election committee, 28 July, but, when it was pointed out that he had voted (presumably for the reformers Robert Way Harty* and Louis Perrin*) in the city contest, the Speaker ruled that the ballot would have to be repeated. The following day O’Connell divided the House, but only mustered 82 (including Samuel, while Henry apparently abstained) against 100 for swearing him with the rest of the original committee.
White returned to Parliament in two spells as Member for county Longford, where he inherited substantial estates and held local office, and was awarded a peerage in 1863. On his death in September 1873, the title was inherited by his eldest son Luke (1829-88), who, like his younger brother Charles William (1838-90), enjoyed a short career in the Commons.
