Callaghan MacCarty, 3rd Earl of Clancarty

Earl of Clancarty is a title that has been created twice in the Peerage of Ireland.

It was created for the first time in 1658 in favour of Donough MacCarty, 2nd Viscount Muskerry, of the MacCarthy of Muskerry dynasty. He had earlier represented County Cork in the Irish House of Commons. Lord Clancarty had already been created a baronet in the Baronetage of Nova Scotia in c. 1638, before he succeeded in the viscountcy. The title of Viscount Muskerry had been created in the Peerage of Ireland in 1628 for his father Charles MacCarty. The first Earl Donough MacCarty was succeeded by his grandson Charles, the second Earl; he was the son of Charles MacCarty, Viscount Muskerry, who was killed during the Second Anglo-Dutch War. Charles, Lord Clancarty died as an infant and was succeeded by his uncle Callaghan MacCarty, the third Earl. On his death the titles passed to his son Donough MacCarty, the fourth Earl. He was a supporter of King James II and was attainted in 1691, with his titles forfeited. His son and heir apparent Robert MacCarty, Viscount Muskerry, served as Governor of Newfoundland but was excepted from the Indemnity Act 1747 which pardoned Jacobites.

The title was created for a second time in 1803 in favour of William Trench, 1st Viscount Dunlo. He had previously represented County Galway in the Irish Parliament and had already been created Baron Kilconnel, of Garbally in the County of Galway, in 1797, and Viscount Dunlo, of Dunlo and Ballinasloe in the Counties of Galway and Roscommon, in 1801. These titles were in the Peerage of Ireland. Trench was a descendant of a daughter of the first Viscount Muskerry, hence his choice of title when elevated to an earldom in 1803. Lord Clancarty had nineteen children and was succeeded by his eldest son, the second Earl. He was a prominent politician and diplomat. Lord Clancarty notably served as President of the Board of Trade and as Ambassador to The Netherlands and sat in the House of Lords as an Irish Representative Peer from 1808 to 1837. In 1815 he was created Baron Trench, of Garbally in the County of Galway, in the Peerage of the United Kingdom, and in 1823 he was further honoured when he was made Viscount Clancarty, of the County of Cork, also in the Peerage of the United Kingdom. On 8 July 1815 he was entered into the Netherlands Nobility by King William I of the Netherlands and granted by Royal Decree the title Marquess of Heusden (Dutch: Markies van Heusden).

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