Leo I, Prince of Armenia
| Leo I Լևոն Ա | |
|---|---|
| Lord of Cilicia | |
| Lord of Armenian Cilicia | |
| Reign | 1129/1130–1137 |
| Predecessor | Constantine II |
| Successor | Thoros II (in 1144/45) |
| Born | c. 1080 |
| Died | February 14, 1140 (aged 59–60) Constantinople |
| Spouse | Beatrix (Beatrice) of Rethel |
| Issue | one/two unnamed daughter(s) (?) Constantine Thoros II Stephen Mleh I Roupen |
| House | Roupenians |
| Father | Constantine I |
| Mother | An unnamed great-granddaughter of Bardas Phokas |
Leo I (Armenian: Լևոն Ա), also Levon I or Leon I, (unknown – Constantinople, February 14, 1140) was the fifth lord of Armenian Cilicia (1129/1130–1137).
He expanded his rule over the Cilician plains and even to the Mediterranean shores. In his time, relations between the Armenians and the Franks (the Crusaders), two former allies, were not always as courteous as before: a major cause of dissension between them was the ownership of the strongholds of the southern Amanus, and on the neighboring coasts of the Gulf of Alexandretta.
Leo was captured after being invited to a meeting by the Byzantine Emperor John II Comnenus, who had sworn a false promise of peace.