Tangible evidence of the existence of the Frisavones includes several inscriptions found in Britain, from Roman Manchester and from Melandra Castle near modern Glossop in Derbyshire.
The earliest mention of the Frisii tells of Drusus' 12 BC war against the Rhine Germans and the Chauci.
The related Caspian Sea fish Rutilus kutum (also called "Kutum", Caspian kutum) has been treated as a subspecies of R. frisii (i.e. R. frisii kutum.