Stephanos of Byzantium - Ethnika
Kassope: a city among the Molossoi, which gives its name to the Kassopia region. The ethnonym is 'Kassopaios' and 'Kassopios' and 'Kassopia'. 'Kassopias' is from 'Kassopios' (as in 'Helikonias'). Herodoros says that they are 'Kassopoi', perhaps incorrectly. All write it with double σσ, but Herodian alone with a single σ.
Stephanos excerpt (left) is aligned with matched Herodian passages (right). Colors indicate corresponding overlap spans.