There are preserved at Prague three stones of a pillar that
the devil is said to have brought from Rome to crush a priest
with whom he had made a compact. The devil planned to kill
him while he said mass, but, says the legend, St. Peter threw the
devil and his pillar into the sea three times in succession, which
gave the priest time for repentance. The devil was so chagrined
that he broke the pillar and saved himself.