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Leo (or Leon) III of Armenia (c.1236-1289) was king of Armenia, ruling from 1270 to 1289. He was the son of Hethum I of Armenia and Isabella of Armenia.
In 1266 Leo was captured and his younger brother Thoros killed while fighting the Mamluk invaders. Leo was ransomed by his father, who abdicated in his favour shortly after. He was known as a pious king, devoted to Christianity.
Leo had seven children by his wife Kyranna de Lampron: