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It's not some obscure story. T.S. Eliot wrote an entire play about the martyrdom of Thomas Becket.

Indeed, though I suspect many might first have learnt of it watching Blackadder. https://www.youtube.com/watch?v=2rNopZDwahg

Or the Richard Burton/Peter O'Toole movie "Becket" (1964) https://www.imdb.com/title/tt0057877/