For a Roman setting, use authentic details like costumes or societal issues (like dowry and marriage) to make the world feel lived-in. A Beginner's Guide on How to Write Drama - Superprof

Remember that all great drama depends on conflict and giving that conflict meaning to the characters.

As they argue, the first wisps of smoke from the Great Fire of Rome rise from the Circus Maximus.

The fire spreads rapidly. The Senator’s guards come to claim Livia, but the Senator himself has fled with his gold, leaving Livia’s father behind. Marcus uses his knowledge of the city’s underground aqueducts to lead Livia and her family to safety as the city burns.