Co-conspirators: three knights, the guys wearing the grey frocks, also known as chain mail or the bullet-proof vests of the Middle Ages. Witness: the man in green, the monk Edward Grim, recognisable by his rod, his haircut and the wound on his right wrist.

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Thomas Becket's murder made him a mediaeval celebrity. A new king was crowned in England in the twelfth century, without permission from the church. The Pope ordered Becket to protest, but Becket was murdered by supporters of the king. This made him such an important defender of the church that he became one of the heroes of the Middle Ages. The struggle between the monarchy and the church was a big thing in those days.

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This book is very old. It dates from the late twelfth century, which means that this picture was painted over 800 years ago. We don't know that much about it, except that it comes from Saint-Omer in France.