A convenient starting point for these reflections is the Ordinance of William I, separating the Spiritual and Temporal Jurisdictions, issued some time between 1070 and 1076. If strictly adhered to this might have prevented some subsequent conflicts, but as we know, the next hundred years saw a number of conflicts in the course of the Investiture Contest leading to the murder of Thomas Becket in 1170. Further conflict in the reign of King John ended in Magna Carta of which Archbishop Stephen Langton is thought to have been the chief inspiration.