John Giles Eccardt

John Giles Eccardt (1720–1779) was a German-born British portrait painter. He came to England in the company of the French painter Jean-Baptiste van Loo for whom he worked as an assistant. When Van Loo departed the country, Eccardt remained and set up a portrait-painting business. In the following years he did portraits of a number of leading members of British society including twenty six of his chief patron Horace Walpole. He died in 1779.

The British politician Henry Fox, 1st Baron Holland.

The diplomat Sir Charles Hanbury Williams.

Portrait of George Montagu after Jean-Baptiste van Loo (c. 1713-1780)
Peterborough Museum and Art Gallery

...
Wikipedia