Saint Anthony the Abbot in the Wilderness. Artist: Osservanza Master (Italian, Siena, active second quarter 15th century). Dimensions: Overall 18 3/4 x 13 5/8 in. (47.6 x 34.6 cm); painted surface 18 1/2 x 13 1/4 in. (47 x 33.7 cm). Date: ca. 1435. T