Dictionary of National Biography, 1885-1900/Hayley, Robert
HAYLEY, ROBERT (d. 1770?), painter, born in Ireland, studied at Dublin under Robert West. He is chiefly noted for a peculiar method of drawing in black and white chalk, successfully imitating mezzotint. Many of his drawings were in the collections of the Earls of Moira and Mornington. Hayley died in Dublin about 1770.
[Redgrave's Dict. of Artists; Pasquin's Artists of Ireland.]