The Battle of Kalavrye was fought in 1078 between the Byzantine imperial forces of general Alexios Komnenos and the rebellious governor of Dyrrhachium, Nikephoros Bryennios the Elder. Bryennios had rebelled against Michael VII Doukas and had won over the allegiance of the Byzantine army's regular regiments in the Balkans. Even after Doukas's overthrow by Nikephoros III Botaneiates, Bryennios continued his revolt, and threatened Constantinople. After failed negotiations, Botaneiates sent the young general Alexios Komnenos with whatever forces he could gather to confront him.

Alexios I Komnenos, Latinized Alexius I Comnenus, was Byzantine emperor from 1081 to 1118. Although he was not the first emperor of the Komnenian dynasty, it was during his reign that the Komnenos family came to full power and initiated a hereditary succession to the throne. Inheriting a collapsing empire and faced with constant warfare during his reign against both the Seljuq Turks in Asia Minor and the Normans in the western Balkans, Alexios was able to curb the Byzantine decline and begin the military, financial, and territorial recovery known as the Komnenian restoration. His appeals to Western Europe for help against the Turks was the catalyst that sparked the First Crusade.