Giuseppe Cesare, called Cavaliere d'Arpino, a bust-length portrait in a twelve-sided frame 1621 Ottavio Leoni (Il Padovano) Italian Late in life, from around 1621 until 1630, Leoni made forty striking portraits of famous men, including this depiction of the Roman artist Cavaliere dArpino (1568-1640). The frames around Leonis portraits indicate the occupation of the sitter: popes and cardinals have a square format, writers have oval frames, and artists have dodecagonal ones. It is possible that despite their similarities, Leonis portrait prints were not intended as a series as such, but simply reflect the fact that he kept working within a preferred visual format over a long period of time.. Giuseppe Cesare, called Cavaliere d'Arpino, a bust-length portrait in a twelve-sided frame 397769