Жизнь двенадцати цезарей
His historical sources include easily identifiable passages from Livy, Suetonius' "The Twelve Caesars", Plutarch and other classical historians, as well as from medieval chroniclers such as Geoffrey of Villehardouin and Jean Froissart. Many of his astrological references are taken almost word for word from Richard Roussat's "" of 1549–50.