The Digest, or Pandects, is a 50-book compendium of Roman laws compiled under the edict of the Byzantine Emperor Justinian I in around 530–533 AD.
I’ve read all of them so you don’t have to, but in Digest 48.9.9, there is a quote from the mid-3rd-century AD jurist Modestinus concerning a punishment for parricide (that’s killing your father, kids).
It lists two alternatives, given at the time of the emperor Hadrian (r.117–138 AD). The convict could choose which one they wanted. The first was to be thrown to wild beasts in the arena and although it doesn’t specify which ones, we must assume it didn’t mean an onager, which was a wild ass, but something a bit more bitey.
The second form of punishment was known as poena cullei and it reads:
According to the custom of our ancestors, the punishment instituted for parricide was as follows; A parricide is flogged with blood-colored rods, then sewn up in a sack with a dog, a dunghill cock, a viper, and a monkey; then the sack is thrown into the depths of the sea.
The church father Eusebius, in his work Martyrs of Palestine records a case of a Christian man named Ulpianus from Tyre who was "cruelly scourged" and then placed in a raw ox-hide, together with a dog and a venomous serpent and cast in the sea.
The incident took place in 304 AD.