Brief synthesisThe Frontiers of the Roman Empire – The Danube Limes (Western Segment) ran for almost 600 km along the River Danube, following the northern and eastern boundaries of the Roman provinces of Raetia (eastern part), Noricum and the north of Pannonia, from Bad Gögging in Germany through Austria to Iža in Slovakia. The western segment of the Danube Limes finally broke down in the 5th century CE. Criterion (iii): The Frontiers of the Roman Empire – The Danube Limes (Western Segment) presents an exceptional manifestation of Roman imperial policy and the Empire’s ambition to dominate the world in order to establish its law and way of life in the long‐term. Criterion (iv): The materials and substance of the Frontiers of the Roman Empire – The Danube Limes (Western Segment) can be seen as a vivid testimony to the way Roman military systems were influenced by geography and, over four centuries, were developed and adapted to meet changing threats to the Empire. On a supra-national level, the Frontiers of the Roman Empire – The Danube Limes (Western Segment) aims to cooperate intensively with the existing Frontiers of the Roman Empire properties, to create a cluster.