Portrait of a Young Man (Raphael). The painting was stolen by the Nazis from Poland. Many historians regard it as the most important painting missing since World War II. And it is still a missing piece of art since.
Vincenzo Catena (Venice, ~ Portrait of a Young Man ~ Venezia ~ ca. 1510 ~ National Gallery, London ~ Vincenzo Catena was an Italian painter of the Renaissance Venetian school. He is also known as Vincenzo de Biagio.
Giuliano de' Medici portrait bust by Verrocchio ~ Andrea del Verrocchio, born Andrea di Michele di Francesco de' Cioni, was an Italian painter, sculptor, and goldsmith who was master of an important workshop in Florence.