LEO IV, called The Khzar, because his mother Irene was the daughter of a Khan of the Chozars, was the son of Constantine V. He was born at Constantinople AD 750, and proclaimed emperor in the following year, in association with his father, whom he succeeded AD 775.
He died AD 780, in the fourth year of his reign, at age 30. His coins, on which he is styled LEO, are very rare in gold, and equally rare in third brass.