Pietro Metastasio
(1728). It tells the story of Flavius Aetius, a Roman general in the 5th century. Ezio is the Italian name for Aetius. Some of the many composers who used this libretto for their operas are George Frideric Handel, Christoph Willibald Gluck, and Nicola Porpora. Porpora was the first composer to use this libretto.