Leo III, King of Armenia

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Leo III or Leon III (occasionally numbered Leo IV; Armenian: Լեիոն Գ, Levon III; 1287/1289 – 1307) was king of the Armenian Kingdom of Cilicia, ruling from 1303 or 1305 to 1307, along with his uncle Hethum II. He was the son of Thoros III of Armenia and Margaret de Lusignan, daughter of King Hugh III of Cyprus and was part of the Hetoumid family.

He was married to his cousin Agnes (Marie) de Lusignan (died 1309), daughter of Princess Isabella of Armenia and Amalric de Lusignan, without issue.

In 1303 or 1305, he was crowned King of Armenia after the retirement of his uncle and Regent Hethum II. The king and his uncle led the Armenian army in 1305 to smash a Mamluk raiding force at Bagras.

In August, 1307, Leo and Hethum were murdered with their retinue while visiting the Mongol emir Bilarghu at Anazarva. He was succeeded as king by his uncle, Oshin.