Born in Mallow, county Cork in 1822, Sullivan was the eldest son of a successful Protestant wine merchant who later moved to Dublin.
Although he was a ‘firm adherent’ of the Liberal party, Sullivan took no part in political life before he was returned for his native borough of Mallow at the 1865 general election (though he had been spoken of for the borough in 1859, and was mooted as a candidate for Kinsale in 1863).
Well informed, and combining swiftness of intellect with a ‘frank, manly bearing’, Sullivan ‘proved himself a notable exception to the general rule, that great lawyers are great failures in Parliament’.
Although in opposition, Sullivan voiced support for the government’s 1867 reform of the Irish court of chancery to provide for the position of an Irish vice-chancellor, a measure he and James Lawson had introduced the year before, but which had been lost in ‘ludicrous’ circumstances.
When the Liberals returned to power in December 1868, Sullivan’s power and resourcefulness as a counsellor earned him the position of Irish attorney-general.
When Gladstone returned to office in 1880, Sullivan had become the most notable figure in the Irish judiciary and, incidentally, an advocate of ‘fair trade’ protectionism.
Sullivan was an outstanding classical scholar and skilled linguist and was remarkable as a book collector. He owned one of the most valuable private libraries in Ireland, which he bequeathed to his eldest son and successor, Sir Edward Sullivan (1852-1928).
