A Harrow friend of Byron's, son of the Lord Chamberlain of Ireland; he once fought a duel with Henry Grattan's son in response to an aspersion on his father. Lord Clare was Governor of Bombay between 1830 and 1834.

CORRESPONDENCE OF John Fitzgibbon, second earl of Clare:

Lord Clare to Lord Byron 28 July 1805 in Letters and Journals of Lord Byron 2 Vols (London: John Murray, 1830)

Lord Byron to the Earl of Clare, 6 February 1807 in Letters and Journals of Lord Byron 2 Vols (London: John Murray, 1830)