A forgotten page of Armenian history.
It's not directly related to the ethnogenesis of Armenians but given that Christianity became an important part of Armenian identity it is important to know.
In 312 the tetrarch Maximinus Daza (or Daia) emperor of Eastern regions of Rome attacked Armenia. He was a fervent pagan and antichristian. In most likelihood he wanted to punish Armenia for adopting Christianity in 301. He lost the campaign and the next year he lost the intra roman struggle for power and died in Tarsus (modern Turkey). In 313 emperors Constantine and Licinius decided to stop the persecution of Christians and allowed them freedom of religious beliefs.