Western powers campaigned intensely for a prohibition on the execution of apostates in the Ottoman Empire. British envoy to the court of Sultan Abdülmecid i (1839–1861), Stratford Canning, led diplomatic representatives from Austria, Russia, Prussia, and France in a "tug of war" with the Ottoman government. In the end (following the execution of the Armenian), the Sublime Porte agreed to allow "complete freedom of Christian missionaries" to try to convert Muslims in the Empire. The death sentence for apostasy from Islam was abolished by the Edict of Toleration, and substituted with other forms of punishment by the Ottoman government in 1844. The implementation of this ban was resisted by religious officials and proved difficult. A series of edicts followed during Ottoman's Tanzimat period, such as the 1856 Reform Edict.