Thomas Becket

On December 29, 1170, four Anglo-Norman knights murdered Archbishop Thomas Becket inside Canterbury Cathedral following his prolonged dispute with King Henry II over royal authority and ecclesiastical independence. The killing in a sacred sanctuary horrified medieval Christendom, turning popular opinion against the crown. A chastened Henry was forced to do public penance and walk back the Constitutions of Clarendon, preserving clerical immunities and the right of appeal to Rome. Becket was swiftly canonized as a martyr, transforming Canterbury into a prime pilgrimage center and cementing church privileges that curbed absolute royal power in England for centuries.