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Leo IV the Khazar (; 25 January 750 - 8 September 780) was Byzantine emperor from 775 to 780AD. He was born to Emperor Constantine V and Empress Tzitzak in 750. He was elevated to co-emperor in the next year, in 751, and married to Irene of Athens in 769. When Constantine V died in September 775, while campaigning against the Bulgars,

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