How did the monarchy get their power?

The medieval people believed that the king was in charge because God had chosen him to. They also thought that the king was above the law. The king's power was limited due to lords and wealthy churchmen. On the day of the coronation of a new king, he had to promise to fulfill the role as king by following the law, maintaining peace and to deliver justice when needed. Lords who defied the king were punished and lost their land and title. Some kings would execute lords and mount their heads on pikes to show the power of the king. Even though the king had lots of power, it was difficult to stay in command when several powerful lords banded together to overthrow the king. During the middle ages, the king threatened lords and nobles into serving him using federal authority and power as a threat to make them follow him.