Are the Roman responsible for the Roman coliseum?
If you mean who was responsible for building the Colosseum, it
was the Flavians. Vespasian began it in 72AD, Titus dedicated and
opened it in 80, and Domitian added finishing touches to it
sometime after 82. After the Flavians, the responsibility for
maintenance was ultimately the emperor's, even though minor
officials would oversee the day to day upkeep.