The surviving second and third acts of Catone in Utica, one of Metastasio's most dramatic libretti, premiered in Verona in the spring of 1737 in a setting by Vivaldi, contains some of his finest, most mature, and most original arias, and are published here for the first time. They evince a potential dramatic intensity that makes us regret all the more the loss of the first act. Only on aria of Act I can be definitely recovered from a surviving opera, but the rest has now also been successfully reconstructed by Alessandro Ciccolini, whose intimate knowledge of Vivaldi's working methods, combined with brilliant stylistic insight won universal acclaim for his work on Vivaldi's Montezuma and Ercole sul Termodoonte.