Robuta

https://commons.wikimedia.org/wiki/Category:Gaudentius_of_Rimini Category:Gaudentius of Rimini - Wikimedia Commons category rimini wikimedia commons https://digital.library.yale.edu/catalog/17470734 Harmonicum enchiridion; with Gaudentius, Introductio harmonica - Yale University Library Nicomachus, of Gerasa; 1585. yale university enchiridion harmonica library