Byzantine emperor (1143–1180), the last great ruler of the Komnenian revival, whose ambitious wars on every front ended with the fateful defeat at Myriokephalon.
Manuel I Komnenos was Byzantine emperor from 1143 to 1180, and the last of the three great emperors of the Komnenian revival that had restored Byzantine power in the twelfth century. Energetic, martial, and fascinated by the Latin West, he pursued a hugely ambitious foreign policy that sought to reassert Roman supremacy from Italy to the Crusader states.
He warred against the Normans of Sicily, imposed his overlordship on the Crusader principality of Antioch, extended Byzantine influence over Hungary and the Balkans, and dreamed of reuniting the Christian churches under his own leadership. But his costly wars strained the empire, and his great expedition against the Seljuk Turks ended in the disastrous ambush at Myriokephalon in 1176 — a defeat that dashed hopes of recovering the Anatolian heartland and cast a long shadow over the empire's future.
Manuel was born in 1118, the fourth and youngest son of the great emperor John II Komnenos. He was not the expected heir, but on campaign in 1143 the dying John, passing over his surviving elder son, named the young and capable Manuel to succeed him. Manuel secured the throne and the capital, and set about a reign that would carry the assertive spirit of his father and grandfather to its most ambitious — and most overreaching — heights.
Manuel was a figure of dazzling energy and contradictions: a formidable soldier who loved the joust and the tournament, a lover of Latin knights and Western ways at the head of the Greek empire, and a restless, grandiose strategist forever pursuing several vast schemes at once. Contemporaries, Greek and Latin alike, were struck by his physical vigour, personal bravery, charm, and intellectual curiosity — he dabbled in theology, astrology, and even medicine.
That same restlessness had its costs. His imagination outran his resources; he scattered the empire's strength across too many fronts and too many grand designs — Italy, Antioch, Egypt, Hungary, church union — draining the treasury and exhausting the army. Admired and even beloved, he was also, in the judgement of some later historians, the brilliant emperor whose overambition set the empire on the road to the crisis that followed his death.
Manuel's reign was a whirl of campaigns and diplomacy in pursuit of a restored Roman supremacy. He fought the Normans of Sicily and launched an ambitious bid to reconquer southern Italy, which won early successes before collapsing. He compelled the Crusader Principality of Antioch to acknowledge Byzantine overlordship, married into the royal house of Jerusalem, and planned joint operations against Fatimid Egypt. In the Balkans he waged repeated wars that brought Hungary and Serbia under his influence.
His grandest ambition was to make himself the arbiter of the Christian world, reuniting the Eastern and Western churches and the two empires under his own primacy. To this end he cultivated the Latins, employed them at his court, and negotiated endlessly with popes and princes — projects that dazzled but ultimately eluded him.
The turning point came against the Seljuk Turks of Rum. In 1176 Manuel led a great army to destroy the Seljuk capital of Konya, but at Myriokephalon, in a narrow mountain pass, the Turks ambushed and mauled his forces. Though not annihilated, the army was broken as an offensive instrument, and Manuel himself compared the disaster to Manzikert. The dream of driving the Turks from Anatolia died there.
Manuel lived on until 1180, when he died of a fever, leaving the throne to his eleven-year-old son Alexios II under the regency of the empress Maria of Antioch.
Manuel I is remembered as the last great emperor of the Komnenian age — a brilliant, ambitious, and cosmopolitan ruler under whom Byzantium cut a dazzling figure on the world stage. Yet his death is often taken as the beginning of the end: his overstretched wars had exhausted the empire, his succession was left to a child, and the anti-Latin reaction and dynastic murder that followed opened the long decline that would culminate in the sack of Constantinople by the Fourth Crusade in 1204.