One thing that it is not mentioned in the article is that there has been another "coliseum" test, built a few years earlier in Capua (currently Santa Maria Capu

One thing that it is not mentioned in the article is that there has been another "coliseum" test, built a few years earlier in Capua (currently Santa Maria Capua Vetere). Same architecture, same techniques. Only a little bit smaller to accommodate the most renown gladiator school of the Empire.