The Roman Emperor Valens built the Valens Aqueduct or Bozdogan Su Kemeri in the 4th century A.D. The Romans provided water for the citizens via aqueducts and filled the cisterns.

The total waterway system length was 270 km. in Constantinopolis. Even though the aqueducts have lost their importance, some of the parts are still standing in Istanbul. The remaining part of the Valen’s Aqueduct is 970 meters today. The Valens Aqueduct is where the Unkapani Bridge, town hall, Şehzade Mosque, and the Golden Horn are located.

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