Simone Martini
Naddo Ceccarelli was a gifted pupil of the leading Sienese painter Simone Martini (ca. 1284–1344). He may have travelled with Martini to Avignon in 1330 and returned to Siena after Martini's death in 1345. He became one of the better-known artists of the master's workshop after Martini's death.