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Leo Diogenes (, Leōn Diogenes, 1069 – 14 August 1087), styled as porphyrogenitus, was the son of Byzantine Emperor Romanos IV Diogenes and Eudokia Makrembolitissa. Likely crowned co-emperor during his father's reign, he later served in the armies of Emperor Alexios I Komnenos. 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 (red sandals) usually reserved to emperors.
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