This is coming from the Doctrine of the Holy Crown, namely, the only soveriegn is the crown itself, and NOT the king himself. This means there is a higher political power than the king, and this is the crown itself. In other nations, the aristocracy (or whoever) named the king, prepared a gold crown for him, and inaugurated the king. In the early days in Hungary, when the Hungarians were looking for a new ruler, there was the Holy Crown, and the aristocracy was looking for a king for the crown (who should have physical and mental capabilities, also the minimum age was fixed; this was unfortunately not always followed). Later, in the Habsburg times, this was abused by Austrians, but in Horthy's time, it was clear and it was/is normal to have a kingdom without a king (which is also included in the Doctrine of Holy Crown), this case is also representing that the highest sovereign is the crown; this is special in the world.