Topic: Tell me a short, interesting fact about

One intriguing fact about the Roman Empire is that it was not called the Roman Empire until the late 16th century. The term "Imperium Romanum" was used by the people of Rome, but it was not commonly used by historians until much later. Historians often refer to the time period as the Roman Republic (509 BC - 27 BC) and the Roman Empire (27 BC - 476 AD) to differentiate these eras.