"Murder in the Cathedral" is a play written by T.S. Eliot that explores the conflict between Thomas Becket, the Archbishop of Canterbury, and King Henry II of England. Set in December 1170, the play dramatizes Becket's return to Canterbury after years of exile and his struggle with the moral implications of power and loyalty. The central event of the play is Becket's assassination by four knights, who believe they are acting on the king's wishes. The play delves into themes of martyrdom, faith, and the consequences of political intrigue, ultimately highlighting the tension between spiritual authority and temporal power.