William Caulfeild, 1st Viscount Charlemont PC (Ire) (1624 – April 1671),[1] was an Irish politician and peer.
[3] Having been first a leading Parliamentarian under Oliver Cromwell, he captured Sir Phelim O'Neil in 1653 and executed him for rebellion and the murder of his brother Toby and his family.
[4] In 1660, the then Lord Caulfeild switched his allegiance and supported afterwards King Charles II of England, captaining a troop of horse.
[5] After the English Restoration, he took his seat in the Irish House of Lords and was sworn of the Privy Council of Ireland.
[5] Viscount Charlemont, as he had become, died in April 1671 and was buried at St Patrick's Cathedral in Armagh on 25 May.