Strabo, Geography
H.C. Hamilton, Esq., W. Falconer, M.A., Ed.

It is difficult to define the boundaries of the Bithynians, Mysians, Phrygians, of the Doliones about Cyzicus, and of the Mygdones and Troes; it is generally admitted that each of these tribes ought to be placed apart from the other. A proverbial saying is applied to the Phrygians and Mysians, ‘The boundaries of the Mysi and Phryges are apart from one another,’ but it is difficult to define them respectively. The reason is this; strangers who came into the country were soldiers and barbarians; they had no fixed settlement in the country of which they obtained possession, but were, for the most part, wanderers, expelling others from their territory, and being expelled themselves. All these nations might be supposed to be Thracians, because Thracians occupy the country on the other side, and because they do not differ much from one another.