Suetonius Divus Augustus 1

THAT the family of the Octavii was of the first distinction in Velitrae , ¹ is rendered evident by many circumstances. For in the most frequented part of the town, there was, not long since, a street named the Octavian; and an altar was to be seen, consecrated to one Octavius, who being chosen general in a war with some neighbouring people, the enemy making a sudden attack, while he was sacrificing to Mars, he immediately snatched the entrails of the victim from off the fire, and offered them half raw upon the altar; after which, marching out to battle, he returned victorious. This incident gave rise to a law, by which it was enacted, that in all future times the entrails should be offered to Mars in the same manner; and the rest of the victim be carried to the Octavii.