161 AD, Spring: Parthian invasion and defeat of the Romans in Armenia
161 AD: The Parthians invade Osroene
161 AD: Parthian invasion and defeat of the Romans in Syria
162 AD, Spring: Co-emperor Lucius Verus departs from Rome
162/3 AD: Verus arrives at Antioch
163 AD: The Roman counteroffensive, aiming at recapturing Armenia, is successful
163 AD: Successful Roman counteroffensive in Syria
Late 163 AD: Verus receives the title ‘Armeniacus’
164 and 165 AD: Roman advance into Mesopotamia
December of 165 AD: Capture of Seleuceia and Ctesiphon
165 AD: Verus receives the title ‘Parthicus Maximus’
165 AD: An epidemic breaks out
166 AD, Spring : Roman permeation into Media
166 AD: Verus receives the title ‘Medicus’
166 AD: End of the war
Early summer of 166 AD: Verus departs from Syria to return to Rome