Saint Arsatius or Arsacius is a saint of whose life virtually nothing is known. He is said to have been a bishop of Milan, who lived either around 400 or in the 6th century, and possibly a martyr, but there is no evidence. Because of the traditional connection with Milan, he is further supposed to have been a disciple of Saint Ambrose, who was also Bishop of Milan, but there is no evidence of this either.

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