Did you know about The Black Saint?

Abba Moses the Black or the Ethiopian, had a remarkable life story illustrating by example the power of repentance in converting one's life 180 degrees from one of the horrible sinners to one of the most powerful saints and martyr in the Name of Christ the Lord God.
Blessed are you, Saint Moses the Black, the Powerful amongst Saints
Sources: The Coptic Synaxarium_ St. Takla Website