It's a Roman locution that means Sack Punishment or Sack Punishment. It was a punishment for the parricides. The condemned man was put in a leather bag, sometimes with animals (especially snakes) and thrown into the water. Later he went on to throw the condemned man into a moat with beasts and finally for the bonfire.
Death penalty of the sack that applied in ancient Rome to the parricides. They were put in a sack, made with the skin of an ox, which had previously been used to transport wine, in the company of a snake, a dog, a monkey and a rooster and thrown into the sea or into a river. However, the Romans' preferred penalty was crucifixion.
