Ruben III (Armenian: Ռուբեն Գ), also Roupen III, Rupen III, or Reuben III, (1145 – Monastery of Drazark, May 6, 1187) was the ninth lord of Armenian Cilicia (1175–1187).
He was the eldest son of Stephen, the third son of Leo I, lord of Armenian Cilicia. His mother was Rita, a daughter of Sempad, Lord of Barbaron. Roupen's father was murdered on February 7, 1165.
Roupen was in charge of Cilicia following the murder of his paternal uncle, Mleh on May 15, 1175.
He was an excellent prince, compassionate and kind; he ruled the country very well, and was praised by everybody.
On 4 February 1181/3 February 1182 he married Isabella of Toron, daughter of Humphrey III of Toron. Before Roupen's 1188 death, Levon became the new ruler.
On his return to his own country Rouben was kind and humane to every one, and at his death left the crown to Leon; he gave him many rules concerning the government of the country, and committed to him his daughters, with an injunction not to give them foreign husbands, that the Armenians might not be governed by foreigners and harassed by a tyrant.
# (4 February 1181 – 3 February 1182) Isabella of Toron, a daughter of Humphrey III of Toron and Stephanie of Milly
Alice (1182 – after 1234), the wife firstly of Hethum of Sassoun, secondly of Count Raymond IV of Tripoli, and thirdly of Vahram of Korikos
Philippa (1183 – before 1219), the wife firstly of Shahanshah of Sassoun, and secondly of Theodore I Laskaris, emperor of Nicaea
Gibb, Sir Hamilton A. R. (1969) . "The Rise of Saladin, 1169–1189". In Setton, Kenneth M.; Baldwin, Marshall W. (eds.). A History of the Crusades, Volume I: The First Hundred Years. Vol. 1 (Second ed.). Madison, Milwaukee, and London: University of Wisconsin Press. ISBN 0-299-04834-9.
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; ISBN 0-7007-1418-9
Runciman, Steven (1952). A History of the Crusades, Volume II: The Kingdom of Jerusalem and the Frankish East. Vol. 2. Cambridge: Cambridge University Press.
Greeks, Crusaders and Moslems — Rise of Leon II (Kurkjian's History of Armenia, Ch. 28)