Farnace is an 18th-century Italian opera in 3 acts by the Czech composer Josef Mysliveček. It was composed to a libretto by the Italian poet Antonio Maria Lucchini that is best known from a setting by Antonio Vivaldi first produced at the Teatro Sant'Angelo in Venice for the carnival operatic season of 1727. For a performance in the 1760s, it would only be expected that a libretto of such age would be abbreviated and altered to suit contemporary operatic taste; this libretto was unusually old, even older than all but one of the librettos by Metastasio that continued by be set in the 1760s. The cuts and changes in the text made for the 1767 performance of Mysliveček's opera are not attributable. Indeed, they are quite extensive; not a single one of Lucchini's original aria texts was re-set