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Leo Diogenes
Byzantine co-emperor · Lived 1069 to 1087 · aged 18
Leo Diogenes, styled as porphyrogenitus, was the son of Byzantine Emperor Romanos IV Diogenes and Eudokia Makrembolitissa. Likely crowned co-emperor together with his elder brother during his father's reign in 1070, he later served in the armies of Emperor Alexios I Komnenos.
Leo Diogenes is read about 19 times a day, in 15 languages.
A typical day, 30 days to 19 August 2026
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He does not appear on any of Romanos' coins, although there is at least one letter that refers to him as emperor (basileus). Anna Komnene notes that he and his brother Nikephoros both wore the diadem and tzangion usually reserved to emperors.