Treverorum: Roman city, modern Trier.
Like so many ancient Roman cities, Trier had an
amphitheater for gladiatorial
contests. It was partly dug inside the slope of the hill of the east
of the city during the reign of Antoninus Pius
(138-161), was included in the city walls, and was renovated after 293, when Constantius Chlorus
moved his residence to the city on the banks of the Moselle. The arena
measured 71 x 47½ meter. Although it has been used as a stone
quarry, the amphitheater is pretty well preserved.
A satellite photo can be seen here.