Tradition states that they were brothers enlisted as soldiers in the army of Licinius.
After refusing to perform military service due to their faith, they were tried and put to death at Tomi.
Another version is that the three brothers who suffered martyrdom at Tomis in Pontus (on the Black Sea), under the Emperor Licinius, who obliged all his soldiers to offer sacrifice to the gods.
Argeus and Narcissus were beheaded, while Marcellinus, only a boy, was flogged, imprisoned, and then drowned by being thrown into the Black Sea.
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