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Alexios I Komnenos or Alexius I Comnenus (Greek: Αλέξιος Α' Κομνηνός, Alexios I Komnēnos) (1048–August 15, 1118), Byzantine emperor (1081–1118), was the nephew of Isaac I Komnenos (emperor 1057–1059), being the third son of that emperor's brother John Komnenos.
By that time Alexios was the lover of the Empress Maria of Alania, the daughter of King Bagrat IV of Georgia who had been successively married to Michael VII Doukas and his successor Nikephoros III Botaneiates, and was renowned for her beauty.
Alexios was for many years under the strong influence of an eminence grise, his mother Anna Dalassene, a wise and immensely able politician whom, in a uniquely irregular fashion, he had crowned as Augusta instead of the rightful claimant to the title, his wife Irene Doukaina.
Alexios accompanied Boniface back to the Crusader fleet, which had moved on to Corcyra, and the Venetians were in favour of the plan when they learned of it.
Alexios was paraded outside the walls, but the citizens were apathetic, as Alexios III, though a usurper and illegitimate in the eyes of the westerners, was an acceptable emperor for the Byzantine citizens.
Alexios did manage to raise half the sum promised, by appropriating treasures from the church and by confiscating the property of his enemies.