Original Sienese Master
Ambrogio Lorenzetti (Sienese, d. 1348)could crank out golden Madonnas as well as any Sienese painter, but Lorenzetti was also a great innovator in subject matter and the treatment of landscapes. His earliest known work is in the museum in San Casciano in Val di Pesa, but he's best knownn for the first and greatest of secular frescoes, the Allegories of Good and Bad Government in Siena’s Palazzo Pubblico.
His last known work, the Annunciation in Siena’s Pinacoteca is one of the 14th century’s most revolutionary treatments of perspective. In Florence, see his Life of St Nicholas and other works in the Uffizi.