The empire stretching from 27 BCE to 476 CE,For questions about the Eastern Roman Empire that conquered everything aroundlater became the MediterraneanByzantine Empire, from England toplease use the Middle Eastmore specific byzantine-empire tag.
classical-antiquity for general questions about the cultural history of the Greco-Roman world
ancient-rome for general questions about the Ancient Rome civilization
roman-kingdom for questions for the Kingdom of Rome, that started with the city's founding
roman-republic for questions specific to the Roman Republic
byzantine-empire for questions specific to the Byzantine Empire
ancient-greece for questions about the related Ancient Greek civilization (see the tag wiki for more related tags)