Byzantium levied a toll on ships using this strait that opens into the Black Sea
[DOC] [TLE] Hieron: The Ancient Sanctuary at the Mouth of the Black Sea [PAR] description of Hieron to date, shows how the entrance to the Black Sea was 
perceived in .... of Byzantium, the temple and main part of the sanctuary must 
have been ..... or a fort to control, levy tolls on, or simply block traffic into or out of 
the.