The amphitheatre is located outside the Roman legionary fortress at Isca Silurum (Caerleon). It was probably constructed c. AD 90. The buttresses supporting the banks can be clearly seen around the southern entrance that provided one of the two main access points to the arena.
The amphitheatre was excavated by (Sir) Mortimer Wheeler, who also wrote the original Ministry guidebook.
The amphitheatre is in the care of Cadw.