In 475, the Mamikonian princess Shushanik, was murdered by her husband Prince Varsken, who was a convert to Zoroastrianism, and was related to the Mihran family.
The reason for this murder was because she had refused to convert to Zoroastrianism and wanted to stay Christian.
The Sasanian shah Peroz I shortly sent an army to punish Vakhtang for intervening.
However, Vakhtang was joined by the Armenians, and a revolt broke out in Armenia, led by Vahan I Mamikonian and Sahak II.
However, in 482, Peroz sent an army under Shapur Mihran, which defeated the Armenian rebels, killing Sahak.