Finally, there was the long-standing difficulty involving the Catholic Church, which culminated in the murder of Thomas Becket, the Archbishop of Canterbury. The problem for the King was that the Church acted like an "imperium in imperio", a "kingdom within a kingdom", only partially, if at all, subject to Henry's laws. The church operated its own court system, which answered not to Henry but to the Pope; it was a large landowner and a powerful vested interest. Henry wished to establish a system of justice that would enlarge the power of the Crown at the expense of the clergy.