Thomas Becket, also known as Saint Thomas of Canterbury, Thomas of London and later Thomas à Becket, served as Lord Chancellor from 1155 to 1162, and then notably as Archbishop of Canterbury from 1162 until his death in 1170. He engaged in conflict with Henry II, King of England, over the rights and privileges of the Church and was murdered by followers of the King in Canterbury Cathedral. Soon after his death, he was canonised by Pope Alexander III. He is venerated as a saint and martyr by the Catholic Church and the Anglican Communion.

Henry the Young King was the eldest son of Henry II of England and Eleanor of Aquitaine to survive childhood. In 1170, he became titular King of England, Duke of Normandy, Count of Anjou and Maine. Henry the Young King was the only English king since the Norman Conquest to be crowned during his father's reign, but he was frustrated by his father's refusal to grant him meaningful autonomous power. He died aged 28, six years before his father, during the course of a campaign in Limousin against his father and his brother Richard.