<Tr> <Td> August </Td> <Td> Gallus and Volusianus were killed in a mutiny at Terni . The army acclaimed Aemilianus, governor of Pannonia and Moesia, ruler of Rome . </Td> </Tr> <Tr> <Td> </Td> <Td> Aemilianus was killed by his own soldiers in the face of the army of the general Valerian (emperor). </Td> </Tr> <Tr> <Td> 22 October </Td> <Td> Valerian gave his son Gallienus the title Caesar . </Td> </Tr> <Tr> <Td> 256 </Td> <Td> </Td> <Td> The Sasanian Empire conquered and sacked Antioch . </Td> </Tr>

Who attacked rome in the 5th and 6th centuries