'''Symphony No. 63''' in C major, Hoboken I/63, is a symphony by Joseph Haydn written sometime between 1779 and 1781. It is often known by the title of the second movement, ''La Roxelane'', named for Roxelana, the influential wife of Suleiman the Magnificent of the Ottoman Empire. This second movement was originally part of Haydn's incidental music for Charles Simon Favart's stage work ''Soliman der zweite'' (or ''Les Trois Sultanes'') in which Roxelana was a character.H. C. Robbins Landon, ''Haydn: Chronicle and Works'', 5 vols (Bloomington and London: Indiana University Press, 1976-), v. 2: "Haydn at Eszterháza, 1766-1790",., in ''Oxford Composer Companions: Haydn'', edited by David Wyn Jones, (Oxford and New York: Oxford University Press, 2002). ISBN 0-19-866216-5.