Born at York, Oxmantown had sat as a Whig for King’s County since reaching his majority in 1821.
Oxmantown held independent views on some leading questions, such as education, but was a strong advocate of the national schools system.
Oxmantown opposed George Robinson’s tax motion, 26 Mar. 1833, and, unusually, opposed the ministry on Henry Lambert’s amendment to prevent the Irish Coercion Act from being used solely for the purpose of enforcing the payment of tithes, 19 Mar.
Oxmantown joined a deputation to Lord Althorp on the Thames tunnel in February 1834, but was absent from divisions on the corn laws, 7 Mar. 1834, and church rates, 21 Apr.
By now considered in Ireland as a Tory, the increasingly fractious politics of his native county made Oxmantown a particular target of O’Connell who, the Morning Post claimed, had ‘railed like a maniac’ against him in public.
In later life Lord Rosse purchased a yacht in which he took his family cruising. He died at his residence in Monkstown after a painful and protracted illness consequent upon the removal of a tumour on his knee.
