Martin Luther publishes his famous pamphlet "Against the Papacy at Rome Founded by the Devil," the last major treatise of his life. It's accompanied by a large number of scatological woodcuts graphically demonstrating what Martin Luther thinks people should do with the papacy. It helps ensure that even those who cannot read will still understand what Luther thinks.
Martin Luther doesn't hold back any of his characteristic vitriol and anger:
"[The Pope] is the head of the accursed church of the very worst rascals on earth; vicar of the devil; an enemy of God; an opponent of Christ; and a destroyer of the church of Christ; a teacher of all lies, blasphemy, and idolatries; an arch-church-thief and church-robber of the keys and al the goods of both the church and the secular lords; a murderer of kings and inciter of all sorts of bloodshed; a brothel-keeper above all brothel-keepers and all lewdness, including that which is not to be named; an Antichrist; a man of sin and child of perdition; a true werewolf."