When did the Byzantine Empire begin?
Byzantine Empire
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Manuel's death on 24 September 1180 left his 11-year-old son Alexios II Komnenos on the throne. Alexios was highly incompetent in the office, and with his mother Maria of Antioch's  Frankish background, made his regency unpopular.[146] Eventually, Andronikos I Komnenos, a grandson of Alexios I, launched a revolt against his younger relative and managed to overthrow him in a violent coup d'état.[147] Utilizing his good looks and his immense popularity with the army, he marched on to Constantinople in August 1182 and incited a massacre of the Latins.[147] After eliminating his potential rivals, he had himself crowned as co-emperor in September 1183. He eliminated Alexios II, and took his 12-year-old wife Agnes of France for himself.[147]