Bonner, Thomas (c.1740-1812); British. Medium: engraving. Date: 1769. Central figure is Sir Philip Francis (1740-1818) the Irish-born British politician who is believed to be the author of 'The Letters of Junius', a series of private and open letters written between 1769-72 on a variety of politically pertinent questions; Provenance: Private Collection. Photographic Rights The Bridgeman Art Library.