Siena 1919 - Siena 1974.
Born in Siena to a Jewish family, due to the fascist racial laws Sadun left his high school studies obtaining his diploma studying privately and already in the first years he frequented artistic circles of the Art Institute and of the Umberto Giunti studio; he then moved to Florence to follow private lessons first with Primo Conti and then with Memo Vagaggini. five years later he won a scholarship in France. In 1950 he exhibited at the Venice Biennale. In 1960 he was given a personal room at the XXX Venice Biennale.