<Tr> <Td> </Td> <Td> 27 BC--395 AD 395--480 (Western) 395--1453 (Eastern) </Td> <Td> </Td> </Tr> <Tr> <Td_colspan="3"> Aureus of Augustus Vexilloid </Td> </Tr> <Tr> <Td_colspan="3"> The Roman Empire in 117 AD, at its greatest extent at the time of Trajan's death (its vassals in pink). </Td> </Tr> <Tr> <Td_colspan="2"> Capital </Td> <Td> Rome (27 BC--AD 410) <P> Mediolanum (286--402, Western) Augusta Treverorum Sirmium Ravenna (402--476, Western) Nicomedia (286--330, Eastern) Constantinople (330--1453, Eastern) Syracuse (663--669, Eastern) </P> </Td> </Tr>

Historians divide roman history into which two periods