For 10 points, name this composer of Mitridate, La Clemenza di Tito, Idomeneo, and La Nozze di Figaro.
Judith Weir reworked the score of one of this man's one act operas, which sees La Costanza sing "Biancheggia in mar." One of this man's operas sees Elissa call Agenor cruel in "Barbaro, oh Dio!" before Amintas sings "L'amerò, sarò costante" The arias "Da schlägt des Abschieds Stunde" and "Bester Jüngling" feature in one of this man's singspiels, which he submitted to compete with a rival composer's First the Music, then the Words. In another work by this composer, Farnace exclaims "Venga Pur, Minacci e Frema" after the title character sings "Se di lauri" upon arriving in Nymphaeum. "Non più di fiori" is sung by Vitellia in another opera, which sees the love duet "Ah, perdona al primo affetto" sung by Annio and Servilia. The composer of works such as Il Sogno di Scipione and Il Re Pastore, he created an opera in which the title character summarizes his reign in "Torna la pace" and which sees Elettra sing "Tutte nel cor vi sento." Another opera by this man sees one character order another to put on female clothing in "Venite, inginocchiatevi" and sees "Voi, che sapete" sung by the page ? Cherubino. For 10 points, name this composer of Mitridate, La Clemenza di Tito, Idomeneo, and La Nozze di Figaro. 
Judith Weir reworked the score of one of this man's one act operas, which sees La Costanza sing "Biancheggia in mar.
Johannes Chrysostomus Wolfgangus Gottlieb Amadeus Theophilus {Mozart}