Valens Aqueduct ( Bozdogan Kemeri) was a Roman aqueduct system built in the years between 368 and 373 in Eastern Roman Emperor Valens (364-378) period.The aqueduct is also known as Bozdogan Kemeri in Turkish, which means “Aqueduct of the Grey Falcon” It was built on the lower area between the third and fourth hill over the water way. The water was brought from the dams outside the walls by pipes and channels. It was 971 meters long with the parts demolished by the Conqueror and the prince. It continued functioning after being repaired in the Ottoman era.It is located in the Fatih district of Istanbul and spans over Atatürk Boulevard. The surviving section of the aqueduct is 921 meters long and about 50 meters less than the original length. The aqueduct is made of stone and brick and has a height of approximately 29 meters