When did Guido of Arezzo live?
Guido of Arezzo
Guido of Arezzo (also Guido Aretinus, Guido Aretino, Guido da Arezzo, Guido Monaco, Guido d'Arezzo, or Guy of Arezzo also Guy d'Arezzo) (991/992 – after 1033) was an Italian music theorist of the Medieval era. He is regarded as the inventor of modern musical notation (staff notation) that replaced neumatic notation. His text, the Micrologus, was the second most widely distributed treatise on music in the Middle Ages (after the writings of Boethius).
Guido Ascanio Sforza di Santa Fiora
Guido Ascanio Sforza di Santa Fiora (26 November 1518 — 6 October 1564) was an Italian cardinal, known also as "The cardinal of Santa Fiora".