Portrait of Sixtus V. Dimensions: plate: 20 1/16 x 14 in. (50.9 x 35.5 cm) sheet: 21 3/16 x 16 5/16 in. (53.8 x 41.5 cm). Publisher: Published by Nicolaus van Aelst (Flemish, Brussels 1526-1613 Rome). Sitter: Portrait of Pope Sixtus V (Felice Peretti