Nevill succeeded to the peerage aged one. Throughout his long minority, his guardianship was exercised by his mother and, following her second marriage, by her husband, the recusant Sir Charles Shelley of Michelgrove. Other members of the family were also closely associated with the Catholic community. Abergavenny’s aunt Elizabeth, dowager Lady Abergavenny, was implicated in the Popish Plot in 1680. An order to arrest her was issued on 11 Nov. 1680 but on 16 Nov. the House learned that she had absconded; a proclamation for her arrest was issued on 27 November. Abergavenny’s cousin Sir John Gifford was noted as being in France in 1695, while another relative, Lady Anne Neville, was abbess of the English Benedictine nuns of Pontoise.
As the head of an ancient Catholic noble family, Abergavenny could reasonably have expected to have been preferred under James II, and at the king’s coronation in 1685 he served in the hereditary office of chief larderer, a position that had been refused his uncle, John Nevill, 10th Baron Abergavenny, at the coronation of Charles II. Still underage and presumably unable to satisfy the requirements of the Test Act, Abergavenny did not take his seat in the new Parliament, but the following year he was dispensed from taking the oaths.
Despite frequent rumours of likely appointments, Abergavenny failed to secure a place of any note. Reports that he was to become treasurer of the household, lord lieutenant of Sussex, and custos rotulorum of Somerset all proved to be inaccurate.
At a call of the House on 31 Mar. 1690, Abergavenny was somewhat curiously listed as ‘under-age’, despite being 24 years old: perhaps a reflection of his relative obscurity. He was well known within the Catholic community, and in October of the same year he was one of the peers nominated by Roger Palmer, earl of Castlemaine [I], to stand bail for him.
On 14 Mar. 1693 Abergavenny presented a petition to the House claiming his privilege as a peer, after a group invaded his bedroom – ostensibly while searching for a highwayman. Abergavenny’s rented lodgings were in a building including a shop where the highwayman was said to have been observed. Witnesses were heard but Abergavenny’s request that the ringleader should be summoned to answer for his actions was rejected.
Abergavenny composed his will the following year. He died in March 1695 aged just 29. An inventory of his possessions compiled in June 1703 recorded £62 found in his pockets, and possessions at his houses in Bedford Row and Isleworth valued at £416 18s. 1½d. His executors, Benedict Richards and William Guise, also declared profits from his estates in Norfolk and Sussex accrued since his death, and the receipt of the principal and interest on a mortgage from ‘Lord Buckingham’ (probably John Villiers, who styled himself earl of Buckingham from 1687) amounting to £6,851 19s. 11d.
