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Leo IV
Emperor of the Byzantine Empire
Leo iv constantine vi coin.jpg
Leo IV and his son Constantine VI
Reign 25 March 775 - June 18, 780
Born 25 January 750
Died 8 September 780 (aged 30)
Predecessor Constantine V
Successor Constantine VI
Consort Irene
Offspring Constantine VI
Dynasty Isaurian Dynasty
Father Constantine V
Mother Tzitzak (Irene of Khazaria)

Leo IV the Khazar (Greek: Λέων Δ΄, Leōn IV), (January 25, 750 – September 8, 780), was Byzantine Emperor from 775 to 780.

Leo was the son of Emperor Constantine V by his first wife, Irene of Khazaria (Tzitzak). His maternal grandfather was Bihar, a Khazar ruler.

Leo was crowned co-emperor by his father in 751, and was married to the Athenian Irene in 769. In 775 he succeeded his father as sole emperor.

In 776 he associated his young son, Constantine, with himself in the empire, and suppressed the first in a series of uprisings led by his half-brothers Christopher and Nikephoros which broke out as a result. The failed claimants to the throne were blinded, tonsured, and exiled.

During his short reign, Leo fought against the Abbasid Caliphate under Al-Mahdi. He dispatched forces into Syria under Michael Lachanodrakon in 776 and 778. Nevertheless, the Abbasid forces succeeded in raiding into Asia Minor in 776, 779, and 780.

Unlike his father and grandfather, Leo showed himself relatively tolerant towards iconodules, and restored an iconophile patriarch. Only at the very end of his reign, in 780, did he have a number of iconodule officials tortured and imprisoned. Following the precedent set by his father, he prepared an expedition against Kardam of Bulgaria, but died before achieving anything of significance.

During his reign Leo was largely under the influence of his wife Irene, and when he died suddenly in 780 she was left as the guardian of his son and successor, Constantine VI.

By his wife Irene, Leo IV had only one child:

Leo IV the Khazar
Born: 25 January 750 Died: 8 September 780
Regnal titles
Preceded by
Constantine V
Byzantine Emperor
Succeeded by
Constantine VI




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