Stephanos of Byzantium - Ethnika
Rhaga: a city in Media [the ethnonym for Rhax is 'Rhagios', but for Rhagai it is 'Rhagenos' as in 'Karrenos'], founded by Seleukos Nikator. It used to be called Europos; it was also renamed Arsake after Arsakes, king of the Persians. There is an island of Lykia, Rhax, but the ethnonym for this is 'Rhagios', and for the city 'Rhagenos'.
Stephanos excerpt (left) is aligned with matched Herodian passages (right). Colors indicate corresponding overlap spans.