Artavasdes I was of Median and possibly of Armenian, Greek descent. He was the child born to Ariobarzanes I by an unnamed wife. His probable paternal uncle could have been Darius I. He was born and raised in the Kingdom of Media Atropatene. Artavasdes I is the namesake of his ancestor, Artabazanes a previous ruling King of Media Atropatene in the 3rd century BC, as the name Artavasdes is a variation of the name Artabazanes. According to modern genealogies the father of Artavasdes I, Ariobarzanes I was a son of a previous ruling King Mithridates I of Media Atropatene and his wife, an unnamed Armenian Princess from the Artaxiad Dynasty who was a daughter of the Armenian King Tigranes the Great and his wife, Cleopatra of Pontus, which can explain the claims of Mithridates I's descendants to the Armenian Kingship in opposition to the lasting ruling monarchs of the Artaxiad Dynasty. Another possibility in linking Artavasdes I to the marriage of Mithridates I and his wife is through his name. The name Artavasdes bears as a typical Armenian royal name and therefore, in all likelihood, Artavasdes I is a descendant of this marriage.
Reign as King
Artavasdes I succeeded his father as King, when Ariobarzanes I died in 56 BC. When Mark Antony led his campaign against the Parthian Empire in 36 BC, Artavasdes I was an ally of the KingPhraates IV of Parthia. Antony led his troops from Zeugma northward into Armenia and then invaded the domain of Artavasdes I. Antony did not want to attack Parthia from the west, which was the shortest way, but surprisingly from the north. Antony allegedly used this strategy on the advice of Artavasdes II of Armenia, the enemy of Artavasdes I. Antony moved with his army in fast marches to Phraaspa, the strong fortified capital of Media Atropatene, where Artavasdes I had got his family to safety. Meantime Artavasdes I had joined the army of Phraates IV. Antony was not able to take Phraaspa and besieged the city, but Artavasdes I and the Parthian commander Monaeses destroyed two legions of Antony's general, Oppius Statianus, who had slowly followed with the siege machines of the Antony's troops. Antony could not capture Phraaspa without these machines. Therefore, he had to withdraw to Armenia and Parthia was not invaded. So Artavasdes I had maintained his ground against the Romans but his domain had been severely ravaged. Besides his stronger ally Phraates IV treated him condescending and gave him only little booty and was near depriving him of his dominion. Therefore, in 35 BC Artavasdes I offered Antony an alliance against Parthia, and Antony gladly accepted. To deepen this friendship Alexander Helios, the son of Antony and Cleopatra VII, was betrothed to Artavasdes I's daughter Iotapa, although both were infants in 34 BC. In 33 BC Antony met his coalition partner on the riverAraxes; they agreed that Antony should support Artavasdes I against Parthia and that the Median King should help Antony against Octavian. They interchanged parts of their troops. The domain of Artavasdes I was enlarged with parts of Armenia. Antony had returned a standard that the Median king had taken from Oppius Statianus in 36 BC, and also took Iotapa along with him. With the help of the Roman reinforcements Artavasdes I was initially able to repulse the Parthian attack. Before the Battle of Actium, Antony called back his Roman troops without sending back the Median reinforcements. This time Phraates IV defeated Artavasdes I who was captured in 30 BC. During Artavasdes' imprisonment, a civil war between the Parthians later took place, which gave him the opportunity to escape prison. He took refuge with Augustus, who received him with friendliness, gave him back his daughter Iotapa and made him a Client King of Lesser Armenia. He died around 20 BC probably in Rome. Artavasdes I was succeeded in the Kingship of Media Atropatene by Asinnalus.
Issue
Artavasdes I was a son-in-law of King Antiochus I Theos of Commagene and his wife, Isias Philostorgos, as he married one of their daughters Athenais, a Princess from Commagene who was of Armenian and Greek descent. Perhaps, Artavasdes I and Athenais may have been distantly related.
In Rome, two Epitaph inscriptions have been found bearing the name of an Artavasdes. The Epitaphs are probably of the son and the grandson of a Median Atropatenian King called Ariobarzanes. However it is uncertain, if the Ariobarzanes refers to Ariobarzanes I or his grandson Ariobarzanes II. Artavasdes I is mentioned in paragraphs 27 and 33 of the Res Gestae Divi Augusti.
