Mesembria

thumb|right|Diobol from Mesembria, ca. 450–350 BCE thumb|right|Reverse of the coin, M-E-T-A among spokes. Mesembria (; ) was an important Greek city in ancient Thrace. It was situated on the coast of the Euxine and at the foot of Mount Haemus; consequently upon the confines of Moesia, in which it is placed by Ptolemy. Strabo relates that it was a colony of Dorians from Megara, and that it was originally called Menebria (Μενεβρία) after its founder Menas; Stephanus of Byzantium says that its original name was Melsembria (Μελσημβρία), from its founder Melsas; and both writers state that the termination -bria was the Thracian word for town. According to the Anonymous Periplus of the Euxine Sea, Mesembria was founded by Chalcedonians at the time of the expedition of Darius I against Scythia; but according to Herodotus it was founded a little later, after the suppression of the Ionic Revolt, by fugitives from Byzantium and Chalcedon. These statements may, however, be reconciled by supposing that the Thracian town was originally colonized by Megarians, and afterwards received additional colonists from Byzantium and Chalcedon.

Mesembria was one of the cities, forming the Greek Pentapolis on the Euxine, the other four being Odessus, Tomi, Istriani and Apolloniatae. Mesembria is rarely mentioned in history, but it continued to exist till a late period, being recorded by Pomponius Mela, Pliny the Elder, and Ptolemy, and appearing in the Peutinger Table. The Dorian colonisation is dated to the beginning of the 6th century BCE, and evidence shows that it was an important trading centre from then on and a rival of Apollonia (Sozopol). It remained the only Dorian colony along the Black Sea coast, as the rest were typical Ionian colonies. At 425/4 BCE the town joined the Delian League, under the leadership of Athens.