Far from being admired as an extraordinary genius, Leonardo da Vinci was repeatedly lampooned and teased about his unusual red hair and his unconventional sexuality by other leading artists of his day. Although the work of the great Italian was popular in his time, an extensive new study of the artist to be published this week has outlined evidence that he was the butt of gossipy jokes in Renaissance Milan.

Author Simon Hewitt has unearthed a little-studied image held in Germany, a “comic strip” design made in 1495 to illustrate a poem, that showed how Leonardo was once ridiculed. In one of its colourful images, An Allegory of Justice, a ginger-haired clerk, or court lawyer, is shown seated at a desk, mesmerised by other young men, and represents Leonardo da Vinci. “The identity of Leonardo as the red-headed scribe is totally new,” Hewitt told the Observer ahead of the publication of Leonardo da Vinci and the Book of Doom.