To avoid this, he fled from the city, but eventually returned to save the Christian people from paying the penalty in his stead, and underwent very cruel treatment at the hands of the pagan mob (Sozomen, Historia Ecclesiastica, x, 10) in 362.
Marcus is said to have been the author of the Creed of Sirmium (351) and is counted by Tillemont as an Arian in belief and in factious spirit.
He was struck from the Roman Martyrology for years, but research by the Bollandists vindicated him and restored his name to the rolls.
The Roman Martyrology commemorates him on 29 March, with the description: "Saint Mark, Bishop of Arethusa in Syria, who in the time of the Arian controversy held firm to the orthodox faith and was severely maltreated under Julian the Apostate.
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