The Lumen family, also known as the Royal Family of the Kingdom of Light, was the most powerful family in the land which ruled over the entire Kingdom. If there was anyone who held the highest authority in the Kingdom after Leaders of Churches of Elements, it was the King himself.
Since Churches didn't often involve themselves in outside matters much, the King effectively held all the control.
Moreover, even though the Church of Light was the most influential in the land, that didn't mean the Royal Family didn't have any influence on the Church of Light. Throughout the years, many of the Head Priests of the Church of Light were from the Lumen Family itself.
Moreover, the second last Head of the Church of Light also came from the Lumen Family. After his death, the family's influence did weaken by a significant amount but not too much.
