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 Komnenoi emperor, Andronikos I, in 1185, the Komnenian Restoration represented the final apex of the fifteen-hundred year history of the Roman Empire.