Martyr Evilasius (died 311) was a

pagan priest Paganism (from classical Latin ''pāgānus'' "rural", "rustic", later "civilian") is a term first used in the fourth century by early Christians for people in the Roman Empire who practiced polytheism, or ethnic religions other than Judaism ...

who tortured a 13-year-old girl who later became

Saint Fausta Fausta of Cyzicus, also known as Saint Fausta (c. 298 – 311), was a 4th-century girl from Cyzicus. At the age of 13, she was arrested, tortured, and executed for being a Christian. A pagan priest, Evilasius, was responsible for torturing an ...

. Realizing her courage, he himself converted to

Christianity Christianity is an Abrahamic monotheistic religion based on the life and teachings of Jesus of Nazareth Jesus, likely from he, יֵשׁוּעַ, translit=Yēšūaʿ, label=Hebrew/Aramaic ( AD 30 or 33), also referred to as Jesu ...

, an act punishable by death since the people of

Cyzicus Cyzicus (; grc, Κύζικος ''Kúzikos''; ota, آیدینجق, ''Aydıncıḳ'') was an ancient Greek town in Mysia in Anatolia in the current Balıkesir Province of Turkey. It was located on the shoreward side of the present Kapıdağ Peni ...

did not want even one of their people to convert to any religion other than their own.Catholic Online
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References

311 deaths 4th-century Romans 4th-century Christian martyrs Converts to Christianity from pagan religions Ancient Roman executioners Saints from Roman Anatolia Year of birth unknown {{saint-stub