Giulio Romolo Caccini (also Giulio Romano) (8 October 1551 – buried 10 December 1618), was an Italian composer, teacher, singer, instrumentalist and writer of the very late Renaissance and early Baroque eras. He was one of the founders of the genre of opera, and one of the single most influential creators of the new Baroque style. He was also the father of the composer Francesca Caccini.