192 CE - The Roman Empire at the death of Commodus:

117 CE - Withdrawal from Assyria, Mesopotamia and Armenia
117 CE - Withdrawal from parts of eastern and western Dacia
122 CE - Establishment of Hadrian's Wall as frontier in north of England
142 CE - Establishment of the Antonine Wall as frontier in Scotland
161 CE - Withdrawal from Antonine Wall back to Hadrian's Wall
166 CE - Conquest of Mesopotamia
168 CE - Dacia returned to being one province
171-180 CE - Conquest of some lands of the Quadi (now Sweden) and Marcomanni north of Danube
180 CE - Withdrawal from the lands of Quadi and Marcomanni north of Danube