Thomas Becket (), also known as Saint Thomas of Canterbury, Thomas of London and later Thomas à Becket (21 December 1119 or 1120 – 29 December 1170), was an English nobleman who served as Lord Chancellor from 1155 to 1162, and then notably as Archbishop of Canterbury from 1162 until his murder in 1170. He is venerated as a saint and martyr by the Catholic Church and the Anglican Communion. 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. Sources The main sources for the life of Becket are a number of biographies written by contemporaries. A few of these documents are by unknown writers, although traditional historiography has given them names. The known biographers are John of Salisbury, Edward Grim, Benedict of Peterborough, William of Canterbury, William fitzStephen, Guernes of Pont-Sainte-Maxence, Robert of Cricklade, Alan of Tewkesbury, Benet of St Albans, and Herbert of Bosham. The other biographers, who remain anonymous, are generally given the pseudonyms of Anonymous I, Anonymous II (or Anonymous of Lambeth), and Anonymous III (or Lansdowne Anonymous). Besides these accounts, there are also two other accounts that are likely contemporary that appear in the Quadrilogus II and the . Besides these biographies, there is also the mention of the events of Becket's life in the chroniclers of the time. These include Robert of Torigni's work, Roger of Howden's and , Ralph Diceto's works, William of Newburgh's , and Gervase of Canterbury's works. Early life Becket was born c. 1119, or in 1120 according to later tradition, at Cheapside, London, on 21 December, the feast day of St Thomas the Apostle. He was the son of Gilbert and Matilda . Gilbert's father was from Thierville in the lordship of Brionne in Normandy, and was either a small landowner or a petty knight. Matilda was also of Norman descent – her family may have originated near Caen. Gilbert was perhaps related to Theobald of Bec, whose family was also from Thierville. Gilbert began his life as a merchant, perhaps in textiles, but by the 1120s he was living in London and was a property owner, living on the rental income from his properties. He also served as the sheriff of the city at some point. Becket's