Henry's 3 main grievances against Becket by 1163:
1) Protection of clerics from lay punishment
2) irregular punishment of the laity for moral offences
3) Disregard for ancient customs and conventions between Crown and Church

After the Constitutions of Clarendon, relations worsened. Becket accused of wrongful behaviour, and found guilty of refusing to attend the King's court.

After being accused for perjury and treachery, Becket fled the court into exile without Henry's jurisdiction, where he remained for 6 years

The King and bishop of London were threatened with excommunication for the crowning of YH. Pope Alexander III later excommunicated both of them