Ad extirpanda was a papal bull issued by Pope Gregory IX in 1233. It authorized the use of the Inquisition to root out heresy, particularly targeting groups like the Cathars in southern France. The document allowed local authorities to seize property and punish those accused of heresy, emphasizing the church's commitment to maintaining religious orthodoxy. The bull established procedures for the investigation and trial of suspected heretics. It aimed to strengthen the church's influence and control over religious beliefs, reflecting the broader context of the medieval struggle between secular and ecclesiastical powers in Europe.