King George IV (1762-1830) as Prince of Wales, & his Brother Frederick, Duke of York and Albany and Bishop of Osnaburgh (1763-1827)   Artist   Benjamin WEST (as artist) Engraver   Valentine GREEN Title   King George IV (1762-1830) as Prince of Wales, & his Brother Frederick, Duke of York and Albany and Bishop of Osnaburgh (1763-1827)    Date   published 4 November 1789 Medium   Mezzotint Lettering   below image: [left] Painted by B. West Historical Painter to his Majesty 1777. [centre] John Boydell excudit 1779. [right] Engraved by Val. Green Mezz.o Engraver to his Majesty / & the Elector Palatine. / [centre] Their Royal Highnesses GEORGE, Prince of WALES, & Prince FREDERICK, Bishop of OSNABURGH. / [centre] Published Nov.r 4. 1779 by John Boydell Engraver in Cheapside London. [armorial in centre of lettering with mottoes HONI SOIT QUI MAL Y PENSE and DIEU ET MON DROIT] Published   John Boydell, Cheapside, London, 4 November 1779 Acquisition   Purchased from Colnaghi, March 1973 Number   10049