(attributed to) JUAN BAUTISTA MARTINEZ DEL MAZO (1612-1667), PORTRAIT OF D. MARIANA OF AUSTRIA Oil on canvas. Carved and gilded wood frame, 19th Century. Traces of two old collection seals in the back. Dim.: 54x44 cm. Note: There is a similar portrait, from the same author, in Museu Nacional de Arte Antiga (Lisbon).