Komnenian restoration
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Through Roman Empire and Holy Roman Empire
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.
Before the Komnenoi
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, east and west causing the army to move back and forth 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 turned to the weakly held Balkan provinces of Byzantium that were ripe for plunder. 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 private estates by the aristocracy, sometimes through purchases but often through intimidation or outright violence. Basil II had been ruthless and successful during his reign at curbing their growing power but after his death, the process recommenced and accelerated. Another issue came in the succession crisis following the death of Basil II brother and successor Constantine VIII. Constantine VIII had no male heirs and as a consequence, the bureaucrats of Constantinople married his daughters Zoe and Theodora to older and incompetent men unfit for rule who were ill-advised and squandered money on trivial things.
As a result of the growing power and militancy of the aristocracy and the succession crisis, the policies of the bureaucrats in Constantinople were to weaken the power of this aristocratic class by freeing Anatolian peasants from their military service and turn them into a tax-paying population. Byzantine frontier defenses fell into decay as successive emperors disbanded the large standing armies of previous eras in order to save money. This caused the armies to be even weaker to deal with external raiding. The bureaucrats then hired mercenaries, notably Normans, to replace the professional army and with ageing conscripts to defend the tenuous frontier. However, the untrustworthiness, unruliness, ambitiousness, and sheer expense of these mercenary troops meant that they disrespected state authority and also conducted raiding in the Byzantine Anatolia, even sometimes working with Turkic raiders whom they were employed to fight against. These mercenary bands also took service with Aristocrats revolting against the government. During this time, the conflict with the Armenians broke out again. The state administration, economy, and military system were allowed to fall into neglect, largely through self-inflicted wounds. The picture of the Byzantine state leading up to 1071 was one of near 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, but was harassed in his way through central and eastern Anatolia by his Armenian subjects. Learning of Byzantine advances towards Manzikert and the reneging of 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 politically divided between 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 militarily decisive but subsequent events spiraled out of control and 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 was captured by the Doukids on his return through Anatolia, blinded and died from his wounds. The reign of Michael VII was turbulent with new civil wars erupting with the withdrawal of Byzantine forces from the frontiers. Now Turkic bands raided in increased number, pillaging further into Eastern and then Central Anatolia unopposed. During this time, much of Anatolia was overrun by the Seljuk Turks, even raiding to the eastern bank opposite Constantinople. The military of the empire completely fell apart as defensive positions were abandoned, and territory was quickly lost to the advancing Turks. The state all but collapsed.
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Alexios I Komnenos (1081–1118)
The reign of Alexios is well-documented due to the survival of the Alexiad, written by his daughter Anna Komnene, which details all of the events of his reign, albeit with a bias towards Alexios. Upon ascension, Alexios inherited a much-weakened empire that was almost immediately beset by a serious invasion from the Normans of Southern Italy. The Normans used the deposition of the previous emperor Michael as the casus belli to invade the Balkans. Alexios did not have a strong enough army to successfully resist the invasion at first and suffered a grave defeat at the Battle of Dyrrachium (1081), which allowed Robert Guiscard and his son Bohemond to occupy much of the Balkans.
The Normans took Dyrrhachium in February 1082 and advanced inland, capturing most of Macedonia and Thessaly. Robert was then forced to leave Greece to deal with an attack on his ally, the Pope Gregory VII, by the Holy Roman Emperor, Henry IV. Robert left his son Bohemond in charge of the army in Greece. Bohemond was initially successful, defeating Alexios in several battles, but he was defeated by Alexios outside Larissa. Forced to retreat to Italy, Bohemond lost all the territory gained by the Normans in the campaign. This victory began the Komnenian restoration.
Shortly after the death of Robert in 1085, the Pechenegs, a nomadic group from north of the Danube, invaded the empire with a force 80,000 strong. Realizing that he would not be able to defeat the Pechenegs by conventional means, Alexios I allied with another nomadic group, the Cumans, to aid him, resulting in the annihilation of the Pecheneg horde at the Battle of Levounion on 28 April 1091.
Alexios I soon took perhaps his most important action as Emperor when he called on Pope Urban II for help in combating the Muslims of Anatolia and the Levant. Alexios particularly hoped to recover Syria and other areas that had been part of the Byzantine Empire in previous centuries. He succeeded in his attempt to rally Western European support, as a surprisingly large contingent of crusaders under Godfrey of Bouillon (among other European nobles) set off from Western Europe and journeyed through Anatolia all the way to their eventual destination of Jerusalem. While relations between crusaders and Byzantines were not always cordial, the coordination between the two armies was instrumental in capturing many important cities in Asia Minor and eventually Jerusalem itself. Between 1097 and 1101 Alexios managed to recover Nicaea, Rhodes, and Ephesus, while also making Antioch his vassal. This brought the Empire to its largest extent since before Manzikert in 1071.
In order to achieve these important military victories, however, Alexios had to resort to drastic measures in order to keep the empire financially afloat amidst so many military expeditions. He did this by melting down many Church artifacts and selling Church lands, while also utilizing conscription to keep the army well-staffed. This led to a diminution of his popularity, but he was nonetheless successful in resurrecting the Byzantine Empire by the time of his death in 1118.
John II Komnenos (1118–1143)
John continued Alexios' military successes and was known throughout his reign to be a kind and cautious commander who never risked Byzantine forces in huge pitched engagements that could have resulted in large catastrophes. Instead, he methodically retook fortresses throughout Anatolia during his reign. Progress was slow and gradual, however, because the Turks in the area were strong and the Byzantine military was not yet at its former heights. Nevertheless, John made steady progress throughout his reign on the Anatolian front, eventually conquering a road to Antioch so that he could keep watch over the Crusader princes who ruled it.
On the Balkan front John achieved a crushing victory over the Pechenegs at the Battle of Beroia in 1122. His victory at Beroia was so decisive that afterwards the Pechenegs ceased to be an independent people and disappeared from most historical records. Due to his continuous military successes the Byzantine empire was kept safe and its realms were free from destruction and allowed to grow and prosper.
During this time John also reorganized the Byzantine army, making it into a professional fighting force, and not the hodge podge of local forces it had been previously. He created permanent, fortified military camps in both Anatolia and the Balkans, where his field armies could be concentrated and trained, and added a large cavalry component to the army (most famously the Kataphraktoi of Macedonia) which allowed the Byzantines to effectively fight the more mobile Turks. Yet John died suddenly in 1143, possibly from a poison arrow treacherously sent to him by jealous crusaders who did not want him to succeed and encroach on their territory or sovereignty. His sudden death kept the Byzantines from continuing their conquests of Anatolia, and historian Zoe Oldenbourg believes that, if John had lived but a few more years, much larger territorial gains would have been made by the Byzantines.
Manuel I Komnenos (1143–1180)
Though Manuel was the youngest of John's four sons he was chosen to succeed his father due to his ability to listen to advice and learn from his mistakes (or so his father discerned). He continued the Komnenian restoration admirably, particularly in the Balkans where he consolidated Byzantine holdings and inflicted a crushing defeat on the Kingdom of Hungary in 1167 at the Battle of Sirmium. With this victory the Kingdom of Hungary was made a vassal of the Empire and, according to noted Byzantine historian Paul Magdalino, Byzantine control over the Balkans was at its most effective point since Late Antiquity.
Additionally Manuel opened up relations with the Western kingdoms, having grown to appreciate their various cultures, and even organized regular jousting competitions. Because of this fondness, he increased diplomatic ties to the West, arranging alliances with the Pope and the Crusaders of the Outremer and successfully dealt with the troublesome Second Crusade that passed through his lands. Conversely, Western Europeans held him in great esteem, and he was described by the Latin historian William of Tyre as "beloved of God...a great-souled man of incomparable energy," highlighting the goodwill he garnered with the previously hostile Western European powers. Indeed, of all the Byzantine emperors it is said that Manuel was the closest to healing the centuries-old rift between the Christian Churches of the East and West, though he never fully achieved this goal.
But in Anatolia, Manuel's successes were more suspect, and his reign is highlighted by his defeat at the Battle of Myriokephalon in 1176 at the hands of the Seljuks. Historians have long debated the importance of this defeat, with some calling it an unmitigated disaster while others say that the emperor emerged from it with most of his army intact. All agree though that the era of Komnenian invincibility ended with this battle, and the empire never again took the offensive in Anatolia, a premonition for the coming weakness of the empire. Regardless of the true story, it is clear that after Myriokephalon Byzantine advances in Anatolia were forever halted and all they could do was merely maintain the status quo afterwards.
Yet the losses were quickly made good, and in the following year Manuel's forces inflicted a defeat upon a force of "picked Turks". The Byzantine commander John Vatatzes, who destroyed the Turkish invaders at the Battle of Hyelion and Leimocheir, not only brought troops from the capital but also was able to gather an army along the way; a sign that the Byzantine army remained strong and that the defensive program of western Asia Minor was still successful.
Andronikos I and the end of the Komnenian Restoration
With Manuel's death in 1180 the Byzantine empire was once again plunged into a succession crisis because his son Alexios II Komnenos was still a minor. Empress Maria ruled the empire as regent, but she was quickly deposed by a series of revolts, and in her place Andronikos I became emperor. Andronikos was known for his incredible cruelty; he often utilized great acts of violence to get others to follow his orders, engendering little sympathy from the common people. Though Andronikos worked tirelessly to root out corruption in the Empire, his heavy-handed tactics against the aristocracy naturally led to dissent, and he was eventually overthrown in 1185.
Of equal importance was his failure to prevent the Massacre of the Latins in Constantinople in 1182 when tens of thousands of Western European traders were massacred by mobs in a xenophobic fervor. This contributed to the disunity between the East and the West that culminated in the sack of Constantinople by the members of the Fourth Crusade in 1204.
The death of Andronikos ended the century-long revival of the Komnenoi, and the Empire descended into civil war as the aristocracy and military elite grappled for control. This led to military weakness, allowing the Turks to regain much of their territory in Anatolia. Within two centuries Constantinople would, for the first time in its thousand-year history as capital of the Byzantine Empire, be conquered by a foreign power. The decline of the Empire began almost immediately, for without the strong Komnenoi emperors, the previous financial and military problems of the Empire became clear and unstoppable.