The Komnenian restoration (1081–1185) is the term used by historians to describe the military, financial, and territorial recovery of the Byzantine Empire under the Komnenian dynasty, from the accession of Alexios I Komnenos in 1081 to the death of Andronikos I Komnenos in 1185. At the onset of the reign of Alexios I, the empire was reeling from its defeat by the Seljuk Turks at the Battle of Manzikert in 1071. The empire was also being threatened by the Normans of Robert Guiscard, who were invading the Balkans from their base in southern Italy. All this occurred as the empire's military institution was in disarray and had grown increasingly reliant on mercenaries. Previous emperors had also squandered the large gold deposits of Constantinople, so the defense of the empire had broken down, and there were few troops to fill the gaps.
The Komnenoi nevertheless managed to reassert Byzantine pre-eminence in the Mediterranean world, militarily and culturally. Relations between the Byzantine East and Western Europe flourished, epitomized by the collaboration of Alexios I and later emperors with the Crusaders (Alexios was instrumental in calling the First Crusade). The scattered and disorganized Byzantine army was restructured into a competent fighting force that became known as the Komnenian Byzantine army. Although the empire rapidly disintegrated after the death of the last Komnenos emperor, Andronikos I, in 1185, the Komnenian Restoration represented the final apex of the fifteen-hundred year history of the Roman Empire.
