Florence. In this period he painted two important portraits: Emperor Sigismund, now in the Kunsthistorisches Museum, Vienna (but the attribution is still contested) and Portrait of a Man (now in the Palazzo Rosso, Genoa). Pisanello returned to Verona between 1433 and 1438. His fresco masterpiece from this period is Saint George and the Princess of Trebizond (c. 1433–1438) at the Pellegrini Chapel, church of Sant'Anastasia, Verona. It had to be restored after water seepage badly damaged the fresco at the end of the 19th century. He prepared for this painting with a large number of drawings, many of which are on display in the Louvre Museum, Paris. Portraits and medal making From 1435, Pisanello became more and more interested in portraiture and medal making. He was introduced to Leonello d'Este, Marquess of Ferrara. His famous Portrait of an Este Princess dates from this period. Pisanello was one of the greatest medalists of all time, perhaps the greatest ever, as evidenced by art historians such as Federico Zeri. He was the first to reinvent the genre as we still understand it today: a portrait on the front and a symbolic feat on the reverse. The medals of the lords of the Italian courts (Gonzaga, Este, Malatesta, Crown of Aragon, etc.) had an extraordinary success, thanks to the perfectly balanced combination of idealization and realism. The powerful people of his time were depicted in profile on the front, as in Roman coins, while on the reverse there were allegorical scenes or highly evocative symbolic figures. All this was often correlated by mottos, symbols and various attributes, according to a cultured, concise and never rhetorical celebratory program, which makes each specimen a true masterpiece. Pisanello's The Vision of Saint Eustace, now at the National Gallery in London, long ascribed to Albrecht Dürer because of its perfection of this very fine panel, shows most animals in profile or defined poses with miniature-like delicacy. The story in this small painting (egg tempera on wood) is probably only a pretext for showing "noble" animals (horses, hunting dogs, stag, bear...) and the noblest creature of all: the hunting courtier. In 1439, the Council of Florence negotiated with the Byzantine Emperor John VIII Palaiologos. On this occasion, Pisanello struck a commemorative medal of the emperor, the earliest portrait medal of post-classical times. He also made some drawings with portraits of the emperor and his retinue (Louvre and Chicago),