Question: Which baroque composer wrote for the King's Theatre in Haymarket?
Related documents: [0]  [DOC] George Frideric (or Frederick) Handel ( ; born Georg Friedrich Händel ] ; 23 February 1685 (O.S.) [(N.S.) 5 March] – 14 April 1759) was a German, later British, baroque composer who spent the bulk of his career in London, becoming well known for his operas, oratorios, anthems, and organ concertos. Handel received important training in Halle and worked as a composer in Hamburg and Italy before settling in London in 1712; he became a naturalised British subject in 1727. He was strongly influenced both by the great composers of the Italian Baroque and by the middle-German polyphonic choral tradition. [END] 
[1]  [DOC] Sosarme, re di Media ("Sosarmes, King of Media", HWV 30) is an opera by George Frideric Handel written in 1732 for the King's Theatre in the Haymarket, London, where it ran for 12 performances. The text was based on an earlier libretto by Antonio Salvi, "Dionisio, Re di Portogallo" (Dionisius, King of Portugal), and adapted by an unknown writer. The original setting of Portugal was changed to Sardis in Lydia. [END] 
Answer: 
George Frideric Handel
George Frideric Handel