An article by William E. Suida on the Twelve Months tapestry series woven at Vigevano for Marshal Gian Giacomo Trivulzio, now in the Castello Sforzesco, Milan. It covers the Marshal's career, the family crests in the borders, a month-by-month description of the scenes and their Latin verses, and the attribution of the cartoons to Bramantino. It also prints, in Italian with an English translation, entries from the Trivulzio account book for 1509-1510 that record payments to the weaver Benedetto da Milano for yarn, gold and silver thread, dyes, and designs. The article is illustrated with plates of each month.