Stephanos of Byzantium - Ethnika
Kotiaeion: a city in Phrygia Epiktetos. Strabo, book 12. Some say that it ought to be 'Kosiaeion'; it does seem that 'Kosaeion' is from the name Kosas, then it becomes 'Kosiaeion' by addition of ι and 'Kotiaeion' through sound shift. The ethnonym is 'Kotiaeus'. There was a grammarian there: Alexander son of Asklepiades, styled 'the most learned', who wrote twenty-four books on miscellaneous matters.
Stephanos excerpt (left) is aligned with matched Herodian passages (right). Colors indicate corresponding overlap spans.