Amero Kingdom's King is the first king boss that you can have a fight with.
He is ruler of human kingdom, Amero Kingdom. His armor contain golden materials and decorations. His weapons is a flanged mace and welding a big kite shield. It is possible that the king has good relationship with Malgar Realm and Talar Country. His favorite color is gold.
After defeating the king, you receive a king's crown as a reward. Boss can be defeated multiple times each new timeline.