from the Synaxarion:
The Holy Martyr Mirax was born into a Christian family that lived in the city of Tennes (Egypt) during the VII Century. He was raised in piety, but yielded to demonic temptation and renounced the Holy Cross, going over to the ruler of Egypt named Amir, and taking up sword in hand he entered into the service of the Arabs. His parents, grieving over the terrible downfall of their son, prayed for him incessantly. And then the grace of God illumined the heart of the prodigal. He deeply repented and returned home. His parents counselled him to openly declare about his fall into darkness and his repentance. Saint Mirax obeyed them. The ruler condemned him to tortures, after which the saint was beheaded and cast into the sea (this occurred not earlier than the year 640).
Holy Martyr Mirax, pray to God for us!