The Flagellants were a group of people who traveled from town to
town for 33.3 days, publicly scourging themselves with strips of
leather tipped with iron spikes as a punishment for the world's
sins. They hoped that this would please God to bring peace and good
health instead of the suffering caused by the Black Death.
The Pope banned the Flagellants because he feared that the
movement would lead to a revolution, as the Flagellants blamed the
Church for the wickedness of the plague.