Henry Frederick, Duke of Cumberland, Jean-Étienne Liotard Jean-Étienne Liotard (22 December 1702 - 12 June 1789) was a Swiss painter, art connoisseur and dealer. He is best known for his portraits in pastel, and for the works from his stay in Turkey. Oil painting on canvas, 40 x5 0 cm The picture is an oil print on canvas and will be sent in a tube. It takes 10 work days for the delivery and it is not an original.