<Tr> <Th> Military engineering </Th> </Tr> <Tr> <Td> <Ul> <Li> Castra </Li> <Li> Siege engines </Li> </Ul> <Ul> <Li> Triumphal arches </Li> <Li> Roads </Li> </Ul> </Td> </Tr> <Ul> <Li> Castra </Li> <Li> Siege engines </Li> </Ul> <Ul> <Li> Triumphal arches </Li> <Li> Roads </Li> </Ul>

When did the roman empire take over spain