Though Margo and Eliot are the most discussed High Kings of Fillory, The Magicians included many rulers of the magical land with varying degrees of success. Though the series heavily featured Brakebills University, a large portion of the show took place in the magical land of Fillory. This world was filled with talking animals, living trees, and citizens with a variety of needs.
https://screenrant.com/the-magicians-show-fillory-rulers-ranked/