Roman Empire, the ancient empire, centred on the city of Rome, that was established in 27 bce following the demise of the Roman Republic and continuing to the final eclipse of the empire of the West in the 5th century ce.
The Roman Empire was the largest empire of the ancient world.
Its capital was Rome.
Its Empire was based in the Mediterranean area.
The Roman Empire at its greatest extent, 117 AD, the time of Trajan's death (with its vassals in pink).
The Holy Roman Empire emerged in the Middle Ages as a loosely integrated union of German states and city-states under the supreme rule of an emperor.