Bosphorus Trade Route

Timeline

1. c. -500–1204Bosphorus Strait · Byzantine EmpireThe Byzantine Empire held the straits at Constantinople, levying tariffs on ships entering and leaving the Black Sea and securing the capital's grain shipping, forming a structural corridor between the eastern Mediterranean and the Black Sea.
2. 1261–1300Constantinople–Galata · Byzantine EmpireAfter Genoa restored its Galata trading quarter in 1261, a commercial enclave rivaling the empire formed on the strait's northern shore, and Black Sea–Mediterranean cargo flows showed dual-center competition in tariffs, anchorage, and shipping insurance.
3. 1301–1310Bosphorus Strait · MediterraneanOver this decade, Black Sea grain, salted fish, and furs reached Constantinople and Italian ports via the Bosphorus; the imperial treasury depended on strait tariffs, but Ottoman expansion in Bithynia increasingly threatened shipping security from the landward side.
4. 1453Bosphorus Strait · TurkeyAfter 1453, the Ottomans unified tariffs and port administration on both shores, incorporating the trade route into imperial maritime policy; in modern times the Suez Canal and railways diverted part of the cargo flow, but the straits remain an important international shipping corridor.