He died a few months after his father's death in the course of a palace intrigue.[1] Vahram of Edessa, the historian tells us that he was cast into prison and poisoned to death.[2]
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[3]
Other historians (e.g., Jacob G. Ghazarian, Vahan M. Kurkjian) suggest that Thoros I died without a male heir[2] and was succeeded by Leon I.[4]
Footnotes
^ abcRunciman, Steven. A History of the Crusades – Volume II.: The Kingdom of Jerusalem and the Frankish East: 1100–1187.
^ abcGhazarian, Jacob G. The Armenian Kingdom in Cilicia during the Crusades: The Integration of Cilician Armenians with the Latins (1080–1093).
^Vahram (2008-09-10). "Chronicle". Text Archive. Internet Archive. Retrieved 2009-07-19.
^Vahan M. Kurkjian (2005-04-05). "A History of Armenia". Website. Bill Thayer. Retrieved 2009-07-19.
Sources
Ghazarian, Jacob G: The Armenian Kingdom in Cilicia during the Crusades: The Integration of Cilician Armenians with the Latins (1080–1393); RoutledgeCurzon (Taylor & Francis Group), 2000, Abingdon; ISBN0-7007-1418-9
Runciman, Steven (1952). A History of the Crusades, Volume II: The Kingdom of Jerusalem and the Frankish East. Cambridge: Cambridge University Press.