St. Thomas Becket, Archbishop of Canterbury, was assassinated by nobles who served King Henry II of England in 1170. They entered the cathedral and killed him. His conflict with the king centered around the Constitutions of Clarendon, a series of laws Henry wished to impose to check the increase in power the Church gained under the rather chaotic reign of his predecessor King Stephan. Becket opposed these laws as the state over reaching into the internal affairs of the Church. Their conflict became more heated until Henry supposedly (though not definitely) was to have said to his barons, “Will no one rid me of this meddling clerk?”. It’s doubtful he actually said that and if he did it certainly would have been in French since Henry II didn’t speak English. This was taken to mean he desired to see Becket gone, so they went to the cathedral on December 29th and killed him.
This all happened before the advent of systematized heraldry as we know it. becket certainly did not have a coat of arms. But, according to the long-standing traditional custom of attributing coats of arms to great persons after the fact a coat of arms was devised for him. It appears in many places erroneously as the coat of arms of St. Thomas Becket of Canterbury. While it certainly was not his actual armorial bearings it is, nevertheless, a very handsome achievement especially impaled with those of the See of Canterbury.