Prittie entered the Irish parliament for Doneraile in 1800 to assist his father’s ambition for a peerage by support of the Union and was left without a seat by its disfranchisement. His elder brother’s succession to the title in January 1801 made an opening for him at Carlow, where the patron was his stepbrother Charles, 1st Earl of Charleville. He held the seat only a few months, inconspicuously, before Charleville sold it to government.
Prittie voted with the outgoing ministers, 9 Apr. 1807, and took their part at the ensuing election in junction with Mathew, although his elder brother tried to persuade the Castle that this was an electioneering gambit ‘and that as to any avowed determined opposition to government, we quite disclaim it’. As he proceeded to vote steadily with opposition, ministers could scarcely be expected to believe his brother, whose prospects of a representative peerage or of a place were by 1809 damaged by Prittie’s adherence to the Ponsonby line. On 21 Oct. 1809 the viceroy wrote:
Mr Prittie ... from his connection with the Ponsonbys is said to be certainly against us. The Ponsonbys have tried to prevent his meeting me at his half brother’s, Lord Charleville’s, but without success, and when I left Charleville Forest he was asked what the Ponsonbys would say to him for having dared to meet me. His answer was they will say a good deal now but still more soon, for I shall take the first opportunity of going to Dublin, where I hope the Duke of Richmond will ask me to dinner. This is going a great way for it is the Ponsonby system to prevent their friends from going to the Castle.
Nothing came of this and his hostility to government continued to stand in the way of his brother’s prospects.
In 1812 he and Montague Mathew were the ‘popular’ candidates in the contest for the county. In that Parliament he attended regularly, voted steadily for Catholic relief (pairing in favour on 24 May 1813)
Prittie at first stood down in 1818, but was persuaded in absentia to stand a poll, in which he was defeated.
