Title: Constantine IV, King of Armenia
Content:  Constantine IV (also Constantine VI; Կոստանդին, Western Armenian transliteration: Gosdantin or Kostantine; died 1373) was the King of Armenian Cilicia from 1362 until his death. He was the son of Hethum of Neghir, a nephew of Hethum I of Armenia. Constantine came to the throne on the death of his cousin Constantine III, whose widow, Maria, daughter of Oshin of Corycos, he married. Constantine formed an alliance with Peter I of Cyprus, offering him the port and castle of Corycus. On Peter's death in 1369, Constantine looked for a treaty with the Sultan of Egypt. The barons were unhappy with this policy, fearing annexation by the sultan, and in 1373 Constantine was murdered. Upon his death he was succeeded by his distant cousin Leo V, one of the Poitiers-Lusignan dynasty, who would become the last king of Cilician Armenia.
Title: Constantine I, King of Armenia
Content:  Constantine I (Կոստանդին Ա, Western Armenian transliteration: Gosdantin or Kostantine;) (also called Constantine III; 1278 &ndash; c. 1310) was briefly king of the Armenian Kingdom of Cilicia from 1298 to 1299. He was the son of Leo II of Armenia and Kyranna de Lampron and was part of the Hetoumid-family. He helped his brother Sempad to usurp the throne in 1296, but turned against him two years later in 1298 to restore his older brother Hethum II. He assumed the throne for a year while Hethum recovered from his imprisonment. Shortly after Hethum's resumption in 1299, Constantine plotted to restore Sempad again, and both were imprisoned for the rest of their lives.
Title: Constantine III, King of Armenia
Content:   Constantine III (also Constantine V; Constantin V d'Arménie; Կոստանդին, Western Armenian transliteration: Gosdantin or Kostantine; April 17, 1313 &ndash; December 21, 1362) was the King of Armenian Cilicia from 1344 to 1362. He was the son of Baldwin, Lord of Neghir (a nephew of Hethum I of Armenia), and second cousin of Constantine II. When Constantine II was killed in an uprising in 1344, Constantine III succeeded him. He attempted to wipe out all rival claimants to the throne; he gave orders to kill Constantine II's nephews, Bemon and Leo, but before the murder could be carried out they escaped to Cyprus. During his rule, Armenian Kingdom of Cilicia was reduced by Mamluk raids and conquests. They conquered Ajazzo in 1347, Tarsus and Adana in 1359. Constantine was the first husband of Maria, daughter of Oshin of Corycos and Joan of Taranto. He was predeceased by his two sons. Upon his death from natural causes he was succeeded by his cousin Constantine IV.
Title: Constantine II, Prince of Armenia
Content:  Constantine II (Կոստանդին Բ), also Kostandin II, (unknown – after February 17, 1129 ) was the fourth lord of Armenian Cilicia or “Lord of the Mountains” (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.
Title: Constantine I, Prince of Armenia
Content:  Constantine I or Kostandin I (1035–1040 – c. 1100) was the second lord of Armenian Cilicia or “Lord of the Mountains” (1095 – c. 1100). He ruled the greater part of the Taurus Mountain regions, while managing the towns and lands within his domain. He provided ample provisions to the Crusaders, for example during the difficult period of the siege of Antioch in the winter of 1097. He was a passionate adherent of the separated Armenian Church.
Title: Constantine II, King of Armenia
Content:   Constantine II (Կոստանդին Բ), (also Constantine IV; Western Armenian transliteration: Gosdantin or Kostantine; died 17 April 1344), born Guy de Lusignan, was elected the first Latin King of Armenian Cilicia of the Poitiers-Lusignan dynasty, ruling from 1342 until his death in 1344.
Title: Constantine of Baberon
Content: Sempad the Constable 1208-1276 ; Hethum I of Armenia 1213-1270 ; John the Bishop of Sis ; Ochine of Korykos, father of the historian Hayton of Corycus ; Maria, who married John of Ibelin, Count of Jaffa and Ascalon, the famous jurist ; Stephanie of Lampron, married in 1237 to King Henry I of Cyprus Constantine of Baberon (died c. 1263) was a powerful Armenian noble of the Het‛umid family. He was the son of Vassag and the father of King Het‛um I, who ruled the Armenian Kingdom of Cilicia from 1226 to 1270. Constantine played a pivotal role in placing his son 
Title: Constantine I of Cilicia
Content:  Catholicos Constantine I, (Armenian: Կոնստանդին Ա. Բարձրբերդցի), was the Catholicos of the Armenian Apostolic Church between 1221 and 1267. A native of Barzrberd, he was said to have come to office not by nobility or riches but by his piety. He officiated at the forced wedding of Queen Zabel to Hetoum I which made them joint Armenian Cilician King and Queen. In 1259 Constantine visited the Mongol warlord Hulegu who had conquered Mesopotamia and blessed him. This was part of an alliance between Cilician Armenia and the expanding Mongol Empire. Hulegu is said to have been sympathetic to Christians, having been the son of one, and did not harm them during his campaigns. The last years of Constantine's reign were very difficult ones. The Mamlukes of 
Title: Leo I, Prince of Armenia
Content:  Leo was the younger son of Constantine I, lord of Armenian Cilicia. It is likely that his mother was the great-granddaughter of Bardas Phokas. When Constantine I died, Leo’s brother Thoros I succeeded him; Leo may have ruled in the eastern part of “the Mountains” during the lifetime of his brother (although the basis of this proposition is not known). Sometime between 1100 and 1103, Count Baldwin II of Edessa gave his sister in marriage to Leo; but the name and origin of his wife are not known with certainty. It is also possible that his wife was Baldwin II’s sister-in-law, a daughter of the Armenian Gabriel of Melitene. In 1111, Sultan Malik Shah of Iconium entered Armenian territories, and two of the commanders 
Title: Constantine I, Prince of Armenia
Content:  After his father’s death in 1095, Constantine extended his power eastward towards the Anti-Taurus Mountains. As an Armenian Christian ruler in the Levant, he helped the forces of the First Crusade maintain the siege of Antioch until it fell to the crusaders. The crusaders, for their part, duly appreciated the aid of their Armenian allies: Constantin was honored with gifts, the title of "marquis", and a knighthood. The Chronographie of Samuel of Ani records that Constantine died soon after a lightning bolt struck his table in the fortress of Vahka. He was buried in Castalon.

Question: Who is the mother of Constantine I, King of Armenia?
Answer: Keran, Queen of Armenia.