(b Hamburg, 1681; d Hamburg, 1764).
Ger. composer, singer, harpsichordist, and theorist. Entered opera ch. 1690, singing tenor roles 1697–1705 during which time he wrote 5 operas and met Handel, with whom he fought a duel after an argument during a perf. of Mattheson's opera Cleopatra in 1704. Mus. dir. Hamburg Cath. 1715–28. Comp. church cantatas. Wrote 8 operas, 24 oratorios and cantatas, 12 fl. sonatas, and much else. Also wrote important books, full of advanced views and much historical material. One of his operas was Boris Goudenow (Hamburg, 1710).