Johann Mattheson (28 September 1681 – 17 April 1764) was a German composer, singer, writer, lexicographer, diplomat and music theorist.Mattheson was born and died in Hamburg. He was a close friend of George Frideric Handel, although he nearly killed him in a sudden quarrel, during a performance of Mattheson's opera Cleopatra in 1704. Handel was saved only by a large button which turned aside Mattheson's sword.