Portrait of Sir Isaac Newton, by John Simon (c.1675-1751), after Sir James Thornhill Half-length portrait of Newton wearing a loose shirt and robe, in an oval frame. The sitter is bare-headed and has one finger extended. Inscribed below: "Isaacus Newton Eq. Aura. I Thornhill Eq. pinx I Simon fec. London Sold by R. Marshall No.4 Aldermany Church Yard" Variation on Keynes, XLV-1, with the addition of Marshall as print-seller, instead of John Simon's Covent Garden address . 18th century [post-1720]