Constantine IV was the King of Armenian Cilicia

Armenian Kingdom of Cilicia

The Armenian Kingdom of Cilicia , also known as the Cilician Armenia, Kingdom of Cilician Armenia or New Armenia, was an independent principality formed during the High Middle Ages by Armenian refugees fleeing the Seljuk invasion of Armenia...

 from 1362 until his death. He was the son of Hethum of Neghir, a nephew of Hethum II of Armenia

Hethum II of Armenia

Hethum II was king of the Armenian Kingdom of Cilicia, ruling from 1289 to 1293, 1295 to 1296 and 1299 to 1303, while Armenia was a subject state of the Mongol Empire...

. Constantine came to the throne on the death of his cousin Constantine III, whose widow, Maria

Marie of Armenia

Marie of Korikos was the daughter of Oshin of Corycos and his second Jeanne of Anjou. She was Queen consort of Armenia by her first two marriages. She was a member of the House of Neghir and House of Lusignan.- Family:...

, daughter of Oshin of Corycos, he married. He is usually considered one of the Lusignan

Lusignan

The Lusignan family originated in Poitou near Lusignan in western France in the early 10th century. By the end of the 11th century, they had risen to become the most prominent petty lords in the region from their castle at Lusignan...

 dynasty.

Constantine formed an alliance with Peter I of Cyprus

Peter I of Cyprus

Peter I of Cyprus or Pierre I de Lusignan was King of Cyprus, and Titular King of Jerusalem from his father's abdication on 24 November 1358 until his own death in 1369. He was also Latin King of Armenia from either 1361 or 1368...

, offering him the port and castle of Corycus

Corycus

Corycus was an ancient city in Cilicia Trachaea, Anatolia, located at the mouth of the river called Şeytan deresi; the site is now occupied by the town of Kızkalesi , Mersin Province, Turkey.-The city:...

. On Peter's death in 1369, Constantine looked for a treaty with the Sultan of Egypt

Sultan of Egypt

Sultan of Egypt was the status held by the rulers of Egypt after the establishment of the Ayyubid Dynasty of Saladin in 1174 until the Ottoman conquest of Egypt in 1517. Though the extent of the Egyptian Sultanate ebbed and flowed, it generally included Sham and Hejaz, with the consequence that the...

. 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

Leo V of Armenia

Leo IV was the last Hethumid king of Cilicia, ruling from 1320 until his death. He was the son of Oshin of Armenia and Isabel of Korikos, and came to the throne on the death of his father. His name is sometimes spelled as Leo or Leon.He spent his minority under the regency of Oshin of Korikos...

, who would become the last king of Cilician Armenia.