Johannes de Muris (1300–1350)
Born 1300 CE, died 1350 CE.
Johannes de Muris (c. 1290–1295 – 1344), or John of Murs, was a French mathematician, astronomer, and music theorist best known for treatises on the ars nova musical style, titled Ars nove musice.
Text from the Wikipedia article Johannes_de_Muris, licensed CC BY-SA 4.0.