William O'Brien, 2nd Marquess of Thomond

William O'Brien, 2nd Marquess of Thomond KP PC (I) (1765 – 21 August 1846) was an Irish peer and Chief of Clan O'Brien. He succeeded by special remainder as Marquess of Thomond in 1808 on the death of his uncle Murrough O'Brien, 1st Marquess of Thomond and was appointed a Privy Councillor and Knight of the Order of St Patrick on 11 November 1809. He was created Baron Tadcaster in the British Peerage in 1826.

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