Who was the music composer that came up with the 12-tone scale system?

Question: Who was the music composer that came up with the 12-tone scale system!?
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According to Wikipedia, Vincenzo Galilei (father of Galileo Galilei) may have been the first person to advocate twelve-tone equal temperament (in a 1581 treatise), although his countryman and fellow lutenist Giacomo Gorzanis had written music based on this temperament by 1567!.Www@QuestionHome@Com