Duccio di Buoninsegna (c. 1255-1260, Siena - c. 1318-1319, Siena) was the most influential Sienese artist of his time and one of the key figures in the development of European painting. Duccio is considered to have had a major influence on the formation of the International Gothic style, and to have influenced Simone Martini and the brothers Ambrogio and Pietro Lorenzetti, among others.