Leontios was Byzantine emperor from 695 to 698. He was given the title of patrikios, and made strategos of the Anatolic Theme under Emperor Constantine IV. He led forces against the Umayyads during the early years of Justinian II's reign, securing victory and forcing the Umayyad caliph, Abd al-Malik ibn Marwan, to sue for peace.

In 692, Justinian declared war upon the Umayyads again and sent Leontios to campaign against them. However, he was defeated decisively at the Battle of Sebastopolis, and imprisoned by Justinian for his failure. He was released in 695 and given the title of strategos of the Theme of Hellas in Southern Greece. After being released, he led a rebellion against Justinian, and seized power, becoming emperor in the same year.

He ruled until 697 when he was overthrown by Apsimar, a droungarios who had taken part in a failed expedition that had been launched by Leontios to recover Carthage. After seizing Constantinople, Apsimar took the name Tiberius III, and had Leontios' nose and tongue cut off. He was sent to the Monastery of Dalmatou, where he remained until some time between August 705 and February 706. By this time Justinian had retaken the throne. Both Leontios and Tiberius were executed.

Depicted here is gold Solidus issued in his reign from Constantinople mint. The obverse of a coin shown bust, bearded, wearing crown and loros, holding akakia and cross on globe. The reverse of a coin depicts cross potent on three steps; mintmark CONOB.

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