Henry O'Brien, 8th Earl of Thomond

He was elected MP for Arundel, Sussex in the Parliament of the United Kingdom in 1710, sitting until 1714.

The 1722 tragedy play Hibernia Freed, staged at the Lincoln's Inn Fields Theatre, was dedicated to him by the author William Philips.

His other titles were forfeited and were eventually inherited by the earls of Inchiquin.

He left his substantial estates in County Clare to Murrough, Lord O'Brien, the young son of his cousin, William O'Brien, 4th Earl of Inchiquin.

On Murrough's death in 1741, the estates passed instead to Percy Wyndham, a nephew of Henry's wife, who took the additional surname of O'Brien and in 1756 was created Earl of Thomond.