Thomas Becket was consecrated as Archbishop of Canterbury on June 3rd. He accepted the pallium sent by the Pope on August 10th. A pallium is a piece of clothe sent by the Pope and is woven from white lamb's wool. It is draped around the neck.
Henry II put his plans before the Council of Westminster to reform the judicial system allowing the courts power over members of the Church which had the luxury of their own courts. Thomas Becket stood against the plans starting a rift between him and Henry that would led to Becket's death.
The Constitutions of Clarendon were series of statements laid down by Henry II regarding the relationship between the church and the state. One statement was the cause for the rift between Henry and Thomas Becket, that said that a member of the church who committed a crime should be available to be tried in a state court and not just a church one. Clarendon is near Salisbury.
At the Council of Northampton the Welsh rebellion and the Constitution of Clarendon were discussed. The Council tried Thomas Becket and found him guilty of perjury for failure to appear at Council and heresy. Becket was sentenced to forfeiture of his possessions. The sentence was quashed by Pope Alexander III and Becket fled to Lincoln on the 14th and then France in early November.
Henry II of England, Louis VII of France and Thomas Becket met at Montmirail to hold peace talks. Becket submitted to Henry excepting only on one point, and the negotiations failed. A second meeting took place at St. Leger-en-Yvelines, and a papal ultimatum was served on Henry.
King Henry II used the Archbishop of York in the coronation of his son Henry, to insult Thomas Becket. This was an act that infringed the rights of the Archbishop of Canterbury. The coronation took place at Westminster Abbey.
King Henry II sent word to England saying that the conflict with Thomas Becket was at an end and his lands should be restored. Hearing this Becket returned to England landing on the south coast at Sandwich.
When Henry II heard that Thomas Becket had returned to England and was threatening to excommunicate his opponents, his outrage was such that four knights overhearing the King travelled to England and killed Becket inside Canterbury Cathedral.