Decet Romanum Pontificem

Decet Romanum Pontificem (from Latin: "It Befits the Roman Pontiff") is a papal bull issued on 3 January 1521 by Pope Leo X to excommunicate German theologian Martin Luther and some of his colleagues—notably Andreas Karlstadt—for refusing to recant forty-one of Luther's Ninety-five Theses, threatened by the earlier papal bull Exsurge Domine. Luther had burned his copy of Exsurge Domine on 10 December 1520 at the Elster Gate in Wittenberg to indicate his response. The title Decet Romanum Pontificem comes from the first three Latin words of its text.