Constantine II, Prince of Armenia

Constantine II (Կոստանդին Բ), also Kostandin II, (unknown – after February 17, 1129) was the fourth lord of Armenian Cilicia (1129/1130 ).

The Chronique Rimée de la Petite Arménie (“The Rhymed Chronicle of Armenia Minor”) of Vahram of Edessa records that he was the son of Thoros I, lord of Armenian Cilicia. His mother's name is not known.

He died a few months after his father's death in the course of a palace intrigue. Vahram of Edessa, the historian tells us that he was cast into prison and poisoned to death.

"After the death of Thoros, his only son and heir was cast into prison by some wicked people, who administered to him a poisonous drug, thus the principality came to Leon, the brother of Thoros (…)."

- Vahram of Edessa: The Rhymed Chronicle of Armenia Minor

Other historians (e.g., Jacob G. Ghazarian, Vahan M. Kurkjian) suggest that Thoros I died without a male heir and was succeeded by Leon I.