Why is Thomas Becket considered to be an important figure in history?
In historical terms, Thomas Becket is important because he is a major example of the tension between the Church and the state in medieval times. During those times, there was only one Christian Church in Western Europe and it had a great deal of power. Its power would often come in conflict with the power of monarchs. This sort of conflict was a major factor in medieval society and it is what led to Becket's death.
On less historical grounds, Becket is seen as an important person because he was a martyr for his conscience. He was willing to die rather than to abandon his beliefs. This makes him a compelling figure to many people.