This unit will define basic concepts and terms that are essential for an understanding of the culture and identity of the Roman empire. Terms such as ‘Roman empire’ and ‘imperium’ will be introduced in the context of the formation and expansion of the empire, and the unit will provide you with the background for further study of the Roman empire. This study unit is just one of many that can be found on LearningSpace, part of OpenLearn, a collection of open educational resources from The Open University. Published in ePub 2.0.1 format, some feature such as audio, video and linked PDF are not supported by all ePub readers.