Study of Two Figures for the Age of Gold, 1637, Black chalk, slightly reworked by the artist with the wet tip of the chalk stick, 12 11/16 x 9 3/4in. (32. 3 x 24. 7cm), Drawings, Pietro da Cortona (Pietro Berrettini) (Italian, Cortona 1596?1669 Rome), In June 1637, Pietro da Cortona, the leading Italian Baroque painter of his time, arrived in Florence and immediately began a fresco cycle commissioned by the Grand Duke of Tuscany, Ferdinando II (1610-1670) and his wife Vittoria della Rovere (1622-1694), for the Camera della Stufa in the Pitti Palace