Don Gaspar de Guzm?n (1587-1645), Count-Duke of Olivares. Artist: Attributed to Vel?zquez (Diego Rodr?guez de Silva y Vel?zquez) (Spanish, Seville 1599-1660 Madrid); and/or Juan Bautista Mart?nez del Mazo (Spanish, Cuenca ca. 1612-1667 Madrid). Dimen