Who built the Colosseum?
The Flavian Amphitheatre was built on the instructions of the Emperor Vespasian. His eldest son, the Emperor Titus, completed the initial building work. The Emperor Domitian, the younger son of Vespasian, built the hypogeum (a series of underground tunnels used to house animals and slaves). Domitian also added a gallery to the top of the Colosseum to increase its seating capacity. Vespasian had a massive work force, having brought back from the Jewish War an estimated 100,000 slaves. Slaves undertook the manual labor and teams of professional Roman builders, engineers and decorators undertook the skilled tasks.