A PORTRAIT MINIATURE OF BYRON'S HALF-SISTER, MS AUGUSTA MARIA LEIGH (1783 - 1851) Vienna, late 19th century  Ms Augusta Maria Leigh (1783-1851) wearing a white dress with gold belt and black cashmere shawl around her shoulders, Signed left hand edge, Cope v Rolf Hille B..CH. de Guérard, Rudolf Hille (b.1875) after Bernard Chevalier de Guerard (German, 1780-1836) Watercolour on ivory Rectangular, 7cm high. Augusta Maria Leigh (nee Byron; 1783-1851) was the half sister of Lord Byron and only daughter of John 'Mad Jack' Byron and his first wife Amelia, nee Darcy (Lady Conyers in her own right and the divorced wife of Francis, Marquis of Carmarthen).