Ezio is an eighteenth-century Italian opera in 3 acts by the Czech composer Josef Mysliveček. It was the composer's second setting of a libretto by the Italian poet Metastasio that was first performed in 1728, one of the most popular of the Metastasian librettos in Mysliveček's day. The story is based on incidents from the lives of the 5th-century Roman emperor Valentinian III and his general Aetius. For a performance in the 1770s, it would only be expected that a libretto of such age would be abbreviated and altered to suit contemporary operatic taste. The cuts and changes in the text made for the 1777 performance of Mysliveček's opera are not attributable. All of Mysliveček's operas are of the serious type in Italian language referred to as opera seria. Performance history The opera was first performed at the Hoftheater in Munich on 10 January 1777. The composer was to have come to Munich a year earlier, but he was detained in Italy due to the effects of syphilis. By the end of 1776, he had temporarily recovered enough to travel to Munich. In the autumn of 1777, he underwent an operation for facial disfigurement associated with his disease that resulted in his nose being burned off. Earlier research assumed that the Munich Ezio was merely a revival of the composer's setting for Naples in 1775, however it has come to light recently that the court of Maximilian III Joseph, Elector of Bavaria, insisted on completely new music, which Mysliveček did provide. The cast included the great castrato Luigi Marchesi, who had earlier appeared only in minor roles, but was given one of the leading roles in this production. His singing was considered superb by the court of Munich, and Mysliveček used his influence with the management of the Teatro San Carlo to engage him for a series of operas in Naples in 1778–79. Mysliveček's intervention enabled Marchesi to establish himself permanently as one of the leading singers in Italy. Except for Marchesi's singing, the opera was not considered to have been particularly successful, and it was overshadowed by the overwhelming success of Mysliveček's oratorio Isacco, figura del redentore, which was performed in the same theater only a few weeks after the run of Ezio ended. Roles Vocal set pieces Act I, scene 2 - Aria of Valentiniano, "Se tu la reggi al volo" Act I, scene 3 - Aria of