Leo IV the Khazar (Greek: Λέων Δ΄ ὁ Χάζαρος Leōn IV ho Khazaros) (25 January 750 – 8 September 780) was Byzantine Emperor from 775 to 780 AD. Leo was the son of Emperor Constantine V by his first wife Irene of Khazaria (Tzitzak) the daughter of a Khagan of the Khazars (thought to be Bihar). Crowned co-emperor by his father in 751 Leo then married Irene an Athenian from a noble family in December 769.
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