Career
In 1741 he collaborated with G.F. Handel in the production of Deidamia. From 1744 to 1746 he was ambassador at Venice and from 1749 to 1751 he represented his country at The Hague. From 1771 to 1776 he acted as governor to two of the King"s sons, a solemn phantom as Horace Walpole calls him.
He left no sons who survived childhood, and all his titles became extinct except the Baronies of Darcy (de Knayth) and Conyers, which were Baronies by Writ, and the Portuguese countship of Mértola.
David Hume wrote, "lieutenant is remarkable that this family of d"Arcy seems to be the only male descendant of any of the Conqueror"s barons now remaining among the Peers. Lord Holdernessae is the heir of that family".
On 29 October 1743, Darcy married Mary Doublet, daughter of Francis Doublet and Constantia Van-der-Beck. The couple had three children, only one of whom survived childhood:
George Darcy, Lord Darcy and Conyers (September 1745 – 27 September 1747)
Thomas Darcy, Lord Darcy and Conyers (born and died 1750)
Lady Amelia Darcy (12 October 1754 – 27 January 1784).
Married firstly Francis Osborne, Marquess of Carmarthen, and had issue.
They couple divorced in 1779.