Pietro Metastasio

Pietro Antonio Domenico Trapassi (3 January 1698 – 12 April 1782), better known by his pseudonym of Pietro Metastasio (Italian pronunciation: [ˈpjɛːtro metaˈstaːzjo]), was an Italian poet and librettist, considered the most important writer of opera seria libretti.

Read more about this composer on Wikipedia.