Arshak III was the last king of the part of Armenia that was put under Roman domination by the Peace of Acilisene

Peace of Acilisene

The Peace of Acilisene was a treaty between the East Roman Empire and the Persian Empire in 387 which divided Armenia between these two empires.-Sources:* Lang, David Marshall. Armenia: Cradle of Civilization. Boston: George Allen & Unwin, 1970. p. 163...

.

Arshak III originally came to power as co-king with his brother Valarshak in 380 during Manuel Mamikonian

Manuel Mamikonian

Manuel Mamikonian was the real leader of Armenia after the death of Varazdat.The Mamikonian family had long been the leading generals of Armenia, holding the title of Sparapet, basically a chief general....

's domination of Armenia. In the mid-380s, after Manuel died, Arshak's power was lessened by invasion of the land by Persian forces.

From 387 on he was only king of a small part of Armenia, west of a line running from Erzurum

Erzurum

Erzurum is a city in Turkey. It is the largest city, the capital of Erzurum Province. The city is situated 1757 meters above sea level. Erzurum had a population of 361,235 in the 2000 census. .Erzurum, known as "The Rock" in NATO code, served as NATO's southeastern-most air force post during the...

 to Mush

Mush

Mush may refer to:*mush , a kind of corn pudding or porridge*mushing , a sport or transport method powered by dogs or a command to a dog team*Muş Province , in eastern Turkey**Muş , the capital of Muş Province...

. He died in 389 and after that Armenia was made a province

Roman Armenia

From the end of the 1st century BC onwards, Armenia was, in part or whole, subject to the Roman Empire and its successor, the East Roman or Byzantine Empire...

 of the Eastern Roman Empire.

Sources

• Lang, David Marshall. Armenia: Cradle of Civilization, (Boston: George Allen & Unwin, 1970) p. 163, 165