ARSENIUS (ARSINUS, ATER) (Saint) Martyr (December 14) (3rd century) A Martyr of the Decian persecution (A.D. 250). Saint Dionysius of Alexandria in a letter to Fabius of Antioch describes the Passion of this Holy Martyr and of Saints Heron and others who suffered with him. He is there named Ater, changed by later biographers into Arsenius and Arsinus. He was an Egyptian, and with the Christians, his companions, was burned to death at Alexandria. A Christian boy, fifteen years old, was arrested at the same time, but only scourged, being then let go on account of his youth.