The large amphitheatre at El Djem is one of the best preserved in the Roman world and could probably have seated 35,000 spectators. It was built around AD 238. More
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Younès, A., Gaied, E. and Gallala, W. (2012). 'Identification of stone blocks used for the building of the Thysdrus and Thapsus amphitheatres in Tunisia', Archaeometry 54.2: 213-29.