What was the difference between the power of a king and the power of a military leader?

The king and the military leader are two high positions in Antiquity and the Middle Ages. The king served as the supreme ruler. He carried out activities to improve life in the state. The king was in charge of the country’s internal affairs and international relations. All peaceful structures were in his jurisdiction. In some countries, he had military power. In some tribes, there was the position of a military leader. The leader was exclusively concerned with the military side of society. The leader was the leader of the army.