Andronikos I Komnenos (Ἀνδρόνικος Κομνηνός; 1117 – 12 September 1185), Latinized as Andronicus I Comnenus, was Byzantine emperor from 1183 to 1185. He was the son of Isaac Komnenos and the grandson of the emperor Alexios I. In later Byzantine historiography, Andronikos I became known under the epithet "Misophaes" ("Hater of Sunlight") in reference to the great number of enemies he had blinded.
Andronikos Komnenos was born around 1118. Most of what is known of him is from the writings of the historian Niketas Choniates, certain passages in a work by Eustathios, 'The Capture of Thessaloniki', or inferred by later historians of the Byzantine Empire. He was handsome and eloquent, active, hardy, courageous, a great general and an able politician, but also licentious. His early years were spent alternately in pleasure and in military service.
In 1141, he was taken captive by the Seljuk Turks and remained in their hands for a year. On being ransomed, he went to Constantinople, where he was held at the court of his first cousin Emperor Manuel I Komnenos, to whom he was a great favourite. Here the charms of his niece, Eudoxia, attracted him and she became his mistress. In 1152, accompanied by Eudoxia, he set out for an important command in Cilicia. After his defeat at the Battle of Mamistra, an attack upon Mopsuestia, he returned but was again appointed to the command of a province. This second post he seems also to have left after a short interval, for he appeared again in Constantinople and narrowly escaped death at the hands of the brothers of Eudoxia.
About 1153, a conspiracy against Emperor Manuel in which Andronikos participated was discovered, and he was imprisoned. After repeated unsuccessful attempts, he escaped in 1165. After passing through many dangers, including captivity in Vlach territory, he reached Kiev, where his cousin Yaroslav Osmomysl of Galicia held court. While under the protection of Yaroslav, Andronikos formed an alliance with the Emperor Manuel I, and with a Galician army he joined Manuel in the invasion of Hungary, assisting at the siege of Semlin.