 Chronicle of Fredegar mentions Carantania as "Sclauvinia", Dante Alighieri (1265–1321) mentions Carantania as "Chiarentana".The same name was also used by Florentines, such as the poet Fazio degli Uberti (circa 1309–1367), the famous chronicler Giovanni Villani (c. 1275–1348), and Giovanni Boccaccio (1313–1375), who wrote that the Brenta River rises from the mountains of Carantania, a land in the Alps dividing Italy from Germany.The population of ancient Carantania had a polyethnic structure.