Corbulo with his army enters Greater Armenia from Cappadocia in the spring of 58, and advances towards Artaxata, while Pharasmanes I of Iberia attacks from the north and Antiochus IV of Commagene attacks from the southwest.
Supported by his brother, Tiridates sends flying columns to raid the Romans far and wide.
Corbulo retaliates by using the same tactics and employing the Iberian tribes, who raid outlying regions of Armenia.
Tiridates I flees his capital, which Corbulo burns to the ground.
In the summer of this year, Corbulo advances towards Tigranakert through rough terrain and passing through the Taronitida (Taron), where several of his commanders die in an ambush by the Armenian resistance.
However, the city opens its gates, with the exception of one of the citadels, which is destroyed in the ensuing assault.
By this time, the majority of Armenians have abandoned resistance and accepted the Herodian prince favored by Rome.
Nero gives the crown to the last royal descendant of the Kings of Cappadocia, the grandson of Glaphyra (daughter of Archelaus of Cappadocia) and Alexander of Judea (the brother of Herod Archelaus and the son of Herod the Great), who assumes the Armenian name Tigranes (his uncle was Tigranes V).
Nero crowns Tigrans in Rome.
Little is known of his life before becoming king.
Raised in Rome, he had married a Phrygian noblewoman from central Anatolia called Opgalli, who may have been a Hellenic Jew.
His wife is only known through surviving numismatic evidence from his kingship.
Opgalli bore Tigranes at least two known children: a son Gaius Julius Alexander and a daughter Julia.
Tigranes and his children are the last royal descendants of the Kings of Cappadocia.
Nero is hailed vigorously in public for this initial victory, and Corbulo is rewarded with the governorship of Syria.
Border districts are bestowed to Roman allies that had assisted Corbulo, including Polemon, Parasmanes, Aristobolus and Antiochus IV of Commagene.
Nero had given to Tigranes a guard of one thousand legionary soldiers, three auxiliary cohorts and two wings of horses were allotted to him in order to defend and protect Armenia.
At the same time, his son Alexander marries Julia Iotapa, a Commagenean Princess and the daughter of King Antiochus IV of Commagene in Rome.
Nero crowns Alexander and Iotapa as Roman Client Monarchs of Cetis, a small region in Cilicia, which was previously ruled by Antiochus IV.
