Joseph Slater

https://en.wikipedia.org/wiki/Joseph_Slater_Jr.

https://research.britishmuseum.org/research/collection_online/search.aspx?searchText=joseph+slater

Very fine Portrait of Thomas Powys 2nd Baron of Lilford

Drawing 3 crayons on paper 28 cm x 21 cm signed lower left J Slater London 1820

Frame 44 cm x 35 cm 

From Wikipedia, the free encyclopedia

Thomas Powys, 2nd Baron Lilford (8 April 1775 – 4 July 1825) was a British peer. He was the son of Thomas Powys, 1st Baron Lilford and Mary Mann of Lilford Hall. He succeeded his father as Baron Lilford in 1800. He was educated at Eton College, St John's College, Cambridge and Lincoln's Inn (1794). He married Henrietta Maria Vernon Atherton of Atherton Hall, Leigh on 5 December 1797 at Penwortham, Lancashire and they had twelve children.^[1]

https://en.wikipedia.org/wiki/Thomas_Powys,_2nd_Baron_Lilford