Simone Martini, (artist), Sienese, active from 1315; died 1344, The Angel of the Annunciation, c. 1330, tempera on poplar panel, painted surface (on recto): 29.5 x 20.5 cm (11 5/8 x 8 1/16 in.), overall: 31 x 21.5 cm (12 3/16 x 8 7/16 in.), painted surface (gesso ground on verso): 21 x 30.2 cm (8 1/4 x 11 7/8 in.), framed: 54.6 x 32.9 x 4.1 cm (21 1/2 x 12 15/16 x 1 5/8 in.).