The medieval name for the Amphitheatre Flavium, a vast amphitheatre in Rome begun by the emperor Vespasian c.75 ad and continued and completed by Titus and Domitian. It was capable of holding c.50,000 people, with seating in three tiers and standing room above; an elaborate system of staircases served all parts. The arena, floored with timber and surrounded by a fence, was the scene of gladiatorial combats, fights between men and animals, and large-scale mock battles.