The last painting on the left wall, started by the Sienese painter Alessandro Casolani and completed by his son Ilario in the second half of the sixteenth century, portrays the announcement of the birth of Jesus to the Virgin Mary. Mary, pictured on the left, is surprised by the visit of the Archangel Gabriel who greets her by handing her a white lily, the symbol of purity. With his right hand, . . .