What was the Iron Gate dam in Antioch?

The Iron Gate is a sixth-century arch dam built east of ancient Antioch, modern-day Antakya in Turkey, by order of the Byzantine emperor Justinian I. It was designed to control torrential seasonal floods from the Parmenios stream that threatened the city centre. Today, it stands as one of the earliest known arch dams and the oldest to survive, though it remains vulnerable to erosion.

What we know

• The Iron Gate was built in the mid-sixth century on the orders of Byzantine emperor Justinian I, who also engaged in major building programs like the Hagia Sophia. [2, 3]
• The dam was constructed to collect and slow the waters of the Parmenios stream to prevent floods in Antioch, which was a major regional capital. [2, 4]
• The structure integrated a former aqueduct and bridge and carried part of Antioch's city wall. [2]
• An innovative arched structure allowed the dam to redirect water pressure into the rock cliffs on either flank. [2]

Where to go next

• whoWho was Emperor Justinian I?
• how it workedHow did ancient arch dams work?
• the bigger pictureWhat was the history of Antioch?
• how we knowHow did Procopius document Byzantine buildings?
• what caused itWhat caused the medieval flood damage at the dam?
• an unexpected connectionHow does a flood control dam connect to early imperial legislation?The same Byzantine emperor who ordered the construction of the Iron Gate dam to protect Antioch also oversaw the comprehensive rewriting of Roman law into the Corpus Juris Civilis.

Sources

• [1]Iron Gate (Wikidata Q139554287) · CC0 1.0
• [2]Iron Gate (Antioch) · CC BY-SA 4.0
• [3]Justinian I · CC BY-SA 4.0
• [4]Antioch · CC BY-SA 4.0
• [5]Walls of Constantinople · CC BY-SA 4.0