Detailed records of expenditures, receipts, and letters from the Duke Galeazzo Sforza and the many people of his court remain today. From these records, much is known about the art commissioned by Galeazzo Sforza and thus the art of Zanetto Bugatto even if most of Bugatto's art no longer remains today. In modern times only one verified work of Bugatto remains, Portrait of Galeazzo Maria Sforza which currently resides in the Castello Sforzesco. Some historians argue that a second work, the portrait of Galeazzo Sforza on the ducal coins of 1467, can be credited to Bugatto as well, however there is still debate over the true source of this work.
