There is a vast amount of documentary material on Siena in the Mediceo del Principato. Each month, Monte dei Paschi di Siena Fellows Drs. Elena Brizio and Stefano Dall’Aglio will add letters of historical importance relating to Sienese culture, food, wine, art, and religion. Particular attention will be paid to all those letters written around the time of Cosimo I’s siege of the city in 1555.