In the decades before the
Komnenoi, the Byzantine Empire had been on a steady decline due to many factors, the most important being the political conflict between the state bureaucracy in Constantinople and the Byzantine military aristocracy. In almost every year since the death of Emperor
Basil II, the aristocracy rose up in revolt across the empire, causing the army to move back and forth from east to west, thus exposing their borders to raiding parties of Normans,
Pechenegs or
Turkic horsemen. The empire's holdings in Southern Italy were finally lost to the
Normans under
Robert Guiscard and his son
Bohemond of Taranto, who quickly plundered the weakly-held
Balkan provinces of Byzantium. In the countryside there existed a free peasantry unlike in Western Europe. However, the growing power of the aristocracy led to the dismantling of the free peasantry and the enlargement of large private estates, sometimes through purchases but often through intimidation or violence.
Basil II had been ruthless in curbing the aristocracy, but after he died they only gained more power and land at the peasants' expense. Another factor in decline was the succession crisis following the death of Basil II's brother and successor
Constantine VIII. Constantine VIII had no male heirs and as a consequence, the bureaucrats of Constantinople arranged for his daughters
Zoe and
Theodora to marry older and incompetent men unfit for rule who were ill-advised and squandered money on trivial things. In response to both the growing power and militancy of the aristocracy and the succession crisis, the bureaucrats in Constantinople tried to weaken the aristocracy by freeing
Anatolian peasants from military service, thus turning them into a tax-paying population. Meanwhile, Byzantine frontier defenses fell into decay as successive emperors tried to save money by disbanding the large standing armies of previous eras. The bureaucrats then hired mercenaries, notably Normans, to replace the professional soldier with cheaper substitutes, usually ageing conscripts. However, the untrustworthiness, unruliness, ambitiousness, and sheer expense of these mercenary troops meant that they disrespected state authority and conducted raids within Byzantine territory, sometimes with the same Turkic raiders they were being paid by the Byzantines to fight against. These mercenary bands also took service with aristocrats who revolted against the government. And then conflict with the Armenians broke out again. Byzantine administration, economy, and military system were allowed to fall into neglect. The state leading up to 1071 was in chaos. Following the war with the
Seljuk Sultanate, in 1071 Emperor
Romanos Diogenes tried to re-assert Byzantine dominance in Anatolia and recapture fortresses lost to the Seljuk Turks by treachery. He was harassed by his Armenian subjects on his expedition through central and eastern Anatolia. Learning of Byzantine advances towards Manzikert and the reneging on their peace settlement, Seljuk Sultan
Alp Arslan turned his army away from attacking the
Fatimid Caliphate towards the Byzantine army. The Byzantine army was internally divided between factions rival aristocrats and claimants such as Doukids to the Byzantine monarchy. These Doukids fled the area near Manzikert, leaving Emperor Romanos alone to fight Alp Arslan. The Battle of Manzikert was not immediately decisive but subsequent events spiraled out of control and it thus constitutes a seminal moment in Byzantine history. Emperor Romanos was captured in battle and proclaimed dead by the Doukids, who returned to Constantinople with
Michael VII Doukas proclaimed Emperor. Romanos was released following the payment of a ransom, but on his return journey through Anatolia was again captured, this time by the Doukids, who had him blinded; he would die from his wounds. The reign of Michael VII was turbulent, as new civil wars ignited after the withdrawal of Byzantine forces from the frontiers. Turkic bands began to raid in increasing numbers and went ever-further going further into Eastern and then Central Anatolia, without opposition. Much of Anatolia was overrun by the Seljuk Turks who penetrated as far as the
Bosporus. The Byzantine military disintegrated as defensive positions were abandoned, and territory was quickly lost to the advancing Turks. The state all but collapsed. ==Alexios I Komnenos (1081–1118)==