Sir Arthur Seymour Sullivan (13 May 1842 ? 22 November 1900) was an English composer, of Irish and Italian descent, best known for his operatic collaborations with librettist W. S. Gilbert, including such continually-popular works as H.M.S. Pinafore, The Pirates of Penzance, and The Mikado. Sullivan's artistic output included 23 operas, 13 major orchestral works, eight choral works and oratorios, two ballets, incidental music to several plays, and numerous hymns and other church pieces, songs, parlour ballads, part songs, carols, and piano and chamber pieces.
Apart from his comic operas with Gilbert, Sullivan is best known for some of his hymns and parlour songs, including "Onward Christian Soldiers", "The Absent-Minded Beggar", and "The Lost Chord". His most critically praised pieces include his Irish Symphony, his Overture di Ballo, The Martyr of Antioch, The Golden Legend, and, of the Savoy Operas, The Yeomen of the Guard. Sullivan's only grand opera, Ivanhoe, was initially highly successful, but it has been little heard since his death.