Research Notes:

Tigranes III was the second son born to Artavasdes II of Armenia by an unnamed mother. Tigranes III had an elder brother called Artaxias II and an unnamed sister who possibly married King Archelaus of Cappadocia. He was born and raised in Armenia....

The Roman Triumvir Mark Antony had captured Artavasdes II with his family, in which they were taken as political prisoners to Alexandria where Artavasdes II was later executed there on the orders of Ptolemaic Greek Queen Cleopatra VII of Egypt. In 34 BC, Artaxias II had escaped and fled to King Phraates IV of Parthia. With the support of Phraates IV, he invaded Armenia and place Artaxias II on the throne.

Sometime after the Battle of Actium in September 31 BC and Octavian (future Roman emperor Augustus) invaded Egypt in 30 BC in which he annexed the country to the rule of the Roman Republic, Tigranes III was taken from Alexandria to live in Rome. In Rome, Tigranes III had lived in political exile... Artaxias II proved to be an unpopular leader with his people.

As the Armenians lost faith in their ruling monarch, they sent messengers to Augustus requesting him to remove Artaxias II from his throne and to install Tigranes III as his successor. Augustus agreed to the request from the Armenians. Augustus sent his step-son Tiberius, with Tigranes III [and] a large army to depose Artaxias II. Before Tiberius and Tigranes III arrived in Armenia, a cabal within the palace was successful in murdering Artaxias II. The Romans installed Tigranes III as the new King of Armenia unopposed.

Tigranes III ruled as King of Armenia for 12 years. Although he reigned for a substantial period of time, little is known on his reign. His Armenian kingship brought peace, stability to Armenia in which peaceful relations between Rome and Armenia were maintained.

Tigranes III was survived by two children from two different unnamed mothers: a son called Tigranes IV and a daughter, called Erato, who succeeded their father on the Armenian throne. ¹