Caulfeild, the son of the 3rd Viscount Charlemont, succeeds his father as 4th Viscount in 1734. The title of Charlemont descends from Sir Toby Caulfeild, 1st Baron Caulfeild (1565–1627) of Oxfordshire, England, who is given lands in Ireland, and creates Baron Charlemont (the name of a fort on the Blackwater), for his services to King James I in 1620. The 1st Viscount is the 5th Baron (d. 1671), who is advanced by Charles II.
Lord Charlemont is well known for his love of Classical art and culture and spends nine years on the Grand Tour in Italy, Greece, Turkey and Egypt. He returns to Dublin and employs the Scottish architect Sir William Chambers to remodel his main residence Marino House, to design his town house Charlemont House and the unique Neoclassical garden pavilion building, the Casino at Marino.
Lord Charlemont is historically interesting for his political connection with Henry Flood and Henry Grattan. He is a cultivated man with literary and artistic tastes, and both in Dublin and in London he has considerable social influence. He is the first President of the Royal Irish Academy and is a member of the Royal Dublin Society. He is appointed Custos Rotulorum of County Armagh for life in 1760. For various early services in Ireland he is made an earl in 1763, but he disregards court favours and cordially joins Grattan in 1780 in the assertion of Irish independence. In 1783 he is made a founding Knight of the Order of St. Patrick.
Lord Charlemont is president of the volunteer convention in Dublin in November 1783, having taken a leading part in the formation of the Irish Volunteers, and he is a strong opponent of the proposals for the Acts of Union 1800. His eldest son, who succeeds him, is subsequently created an English Baron in 1837.
Lord Charlemont dies on August 4, 1799.
(Pictured: Charlemont as painted by Pompeo Batoni, c. 1753-56)