One of the most important items in the museum is the stained glass window by Duccio di Buoninsegna (ca. 1255-1318/19), originally installed in the apse of the Duomo but now replaced with a copy. The window was made between 1287 and 1288 and is a splendid work of art.In the central pane, we see the Assumption of the Virgin. This is hardly surprising, since Siena’s cathedral is dedicated to Santa Maria Assunta. Below this pane is the Burial of the Virgin and above it her Coronation. In the four corners are the four Evangelists with their respective symbols. Flanking the pane showing the Assumption are Siena’s four patron saints, two on each side. They are Bartholomew, Ansanus, Crescentius and Savinus. A caption in the museum claims that “the scenes reveal the gentle narrative style of the great Sienese master and a new sense of space probably derived from the work of Giotto”. The latter claim seems a bit far-fetched. Giotto (ca. 1266-1337) would have been only in his early twenties in 1287 and still very much unknown.