id author title date pages extension mime words sentences flesch summary cache txt en-wikipedia-org-1548 Leo IV the Khazar - Wikipedia .html text/html 1686 311 67 Illustration of Leo IV (left) and his son Constantine VI (right) from the Icones Imperatorum Romanorum (1557), based upon Byzantine coins minted bearing their images 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. When Constantine V died in September 775, while campaigning against the Bulgarians, Leo IV became senior emperor on 14 September 775. He was meant to be succeeded by his son Constantine VI, but rule instead transferred to his wife Irene, who assumed the role of regent and later empress. He was succeeded by his son Constantine, with Leo's wife Irene as his regent. Constantine III with son Constans II Constantine IV with brothers Heraclius and Tiberius and then Justinian II as co-emperors Leo V the Armenian with Symbatios-Constantine as junior emperor Romanos I Lekapenos with sons Christopher, Stephen and Constantine as junior co-emperors ./cache/en-wikipedia-org-1548.html ./txt/en-wikipedia-org-1548.txt