Brief SynthesisThe Roman Empire, in its territorial extent, was one of the greatest empires history has known. Criterion (ii): The extant remains of the fortified German Limes, Hadrian’s Wall and Antonine Wall constitute significant elements of the Roman Frontiers present in Europe. With their forts, fortlets, walls, ditches, linked infrastructure and civilian architecture they exhibit an important interchange of human and cultural values at the apogee of the Roman Empire, through the development of Roman military architecture, extending the technical knowledge of construction and management to the very edges of the Empire. They bear an exceptional testimony to the maximum extension of the power of the Roman Empire through the consolidation of its northwestern frontiers and thus constitute a physical manifestation of Roman imperial policy. IntegrityThe inscribed components convey the extraordinary complexity and coherence of the Frontiers of the Roman Empire in northwestern Europe.