They are mentioned by Pliny the Elder as one of the Alpine tribes conquered by Rome in 16–15 BC, and whose name was engraved on the Tropaeum Alpium.[1]
Anreiter, Peter (1997). Breonen, Genaunen und Fokunaten: vorrömisches Namengut in den Tiroler Alpen. Innsbrucker Beiträge zur Kulturwissenschaft. ISBN978-963-8046-18-5.