Thoros was the second son of Leo I, lord of Armenian Cilicia. In 1136, Leo I (Thoros's father) was arrested by
Baldwin of Marash. Leo I took refuge in the
Taurus Mountains, but at last found the situation hopeless, and surrendered himself to the conqueror; Thoros was kidnapped with his father and his youngest brother, Roupen. They were dragged away to Constantinople, where Leo I died in imprisonment in 1141. Roupen, after being blinded, was assassinated by the Greeks. ==Lord of Armenian Cilicia==