The Constitutions of Clarendon
King Henry II presided over the assemblies of most of the higher English clergy at Clarendon Palace on 30 January 1164. In sixteen constitutions, he sought less clerical independence and a weaker connection with Rome. He employed all his skills to induce their consent and was apparently successful with all but Becket. Finally, even Becket expressed his willingness to agree to the substance of the Constitutions of Clarendon, but he still refused to formally sign the documents. Henry summoned Becket to appear before a great council at Northampton Castle on 8 October 1164, to answer allegations of contempt of royal authority and malfeasance in the Chancellor's office. Convicted on the charges, Becket stormed out of the trial and fled to the Continent.
Henry pursued the fugitive archbishop with a series of edicts, aimed at all his friends and supporters as well as Becket himself; but King Louis VII of France offered Becket protection. He spent nearly two years in the Cistercian abbey of Pontigny, until Henry's threats against the order obliged him to return to Sens. Becket fought back by threatening excommunication and interdict against the king and bishops and the kingdom, but Pope Alexander III, though sympathising with him in theory, favoured a more diplomatic approach. Papal legates were sent in 1167 with authority to act as arbitrators.
In 1170, Alexander sent delegates to impose a solution to the dispute. At that point, Henry offered a compromise that would allow Thomas to return to England from exile.
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