Ad abolendam ("On abolition" or "Towards abolishing") was a decretal and bull of Pope Lucius III, written at Verona in November 1184. It was developed after the Council of Verona settled some jurisdictional differences between the Papacy and the Holy Roman Emperor Frederick Barbarossa. The document prescribes measures to uproot heresy and sparked the efforts which culminated in the Albigensian Crusade and the Inquisitions. Its chief aim was the complete abolition of Christian heresy.