Why would pilgrims have gone to visit thomas beckets shrine at canturbury

Thomas Becket was considered a martyr because he defended Church rights against the wishes of King Henry II of England and died for his beliefs (killed by the King's followers). He later became a saint, as he was viewed as someone who was murdered for the wrong reasons and died with his faith intact. People made pilgrimages to his shrine in order to pay tribute and receive special graces and spiritual measures. His shrine in Canterbury was later destroyed by King Henry VIII.