Works discussed:
Duccio di Buoninsegna, Madonna Enthroned, c. 1285 (Uffizi Gallery, Florence)
Simone Martini, Annunciation Altarpiece, 1333 (Uffizi Gallery, Florence)
Ambrogio Lorenzetti, Effects of Good Government in the City and in the Country, 1338-1339 (Sala della Pace, Palazzo Pubblico, Siena)
http://smarthistory.org/duccio-and-siena.html
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