The Chersonesus appears gradually to have become completely hellenised, although the Thracians were otherwise very obstinate. They entirely disappeared there, either because they quitted the peninsula or because they became amalgamated with the Greeks, for in the time of Philip all the people were Greek, and from the time of Timotheus onward, for a period of several years, the country was completely Athenian. But as the Athenians sent cleruchi into it, the Thracians revolted: hence the interference of Philip, who took possession of the peninsula. This was the occasion of Demosthenes’ speech, περὶ τῶν ἐν Χερσονήσῳ. We shall now proceed along the Thracian coast as far as the mouth of the Pontus, and then cross over to the coast of Asia. The sea between the Hellespont and the Bosporus was called _Propontis_. The continuous line of coast of this sea never was entirely in the hands of the Greeks, but they possessed the most important points. On the Thracian coast, between Chersonesus and Perinthus, they had but few places, but the whole of the Bosporus was in their hands. The most important of these places is Perinthus; but before we come to it there are several smaller ones, which I will pass over. PERINTHUS, a Samian colony, if we consider the course of the history of Samos, cannot have been founded after the time of the Persian war, and must probably be assigned to the time of Polycrates. This is a point which is self-evident, though no writer mentions it. The town is rarely noticed in history, and is remarkable only on account of the siege of Philip in Olymp. 109, when it was saved by the energetic assistance of Athens, which was afforded to it on the proposal of Demosthenes. The Byzantine colony of SELYMBRIA (_bria_ with the Thracians signified a town, as in Mesembria) was situated between Perinthus and Byzantium.