Known by the Greeks as Istros and by the Romans as Danubius, the Danube represented not only the easiest way for navigation, but also an inexhaustible rezervoir of necessary products for mediterranean lands. This is the the reason why the Greeks and later on the Romans and the Byzantium were so interested in this regions.
Herodotus: „Thrace spreads across the seaside, before it gets to Scythia which begins from that part where the shore makes a gulf and where the Istru flows, with the egress turn to sunrise.”

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Strabo makes on of the most detailed antique description of the Danube’s egress region:  “Istru flows trough seven egresses, from which the biggest is Hieron Stoma (the Holy Egress)”. The majority of the commentators of the antique texts recognize the Hieron stoma as the nowadays Sf. Gheorghe branch. Describing the sea shore, Strabo makes reference to the existent strongholds: “Sailing near the shore towards South, from the Holy Egress on the right side, at 500 stadia (91 km) is the town of Histria, grounded by the Milesian people. Then, there is Tomis, another city, at 250 stadia (45 km) away from the first one, then, at 280 stadia (50 km) is the city of Callatis, the colony of Heraclit people.

Pliny the Elder (23-79 B.C.) describes the situation from the Danube’s egresses: “the Danube flows in to the Pont through six big egresses. First of them is Peuce. The river bed of the Peuce branch is absorbed by a large pond, nineteenth thousand feet long (28.5 km). From the same river bed and upwards Istropolis forms a sixty-three thousand feet (94.5 km) lake, called Halmyris.

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