Prythian is the land of the Fae and is ruled by the Seven Courts, the Summer Court, the Spring Court, the Winter Court, the Autumn Court, the Day Court, the Dawn Court, and the Night Court. Tarquin is the high lord of the Summer Court. Tamlin is the high lord of the spring court. Kallias is the high lord of the Winter Court. Beron Vanserra is the high lord of the Autumn Court. Helion is the high lord of the Day Court. Thesan is the high lord of the Dawn Court. Rhysand is the high lord of the Night Court.
The top ruler in each court is the High Lord. In the Night court Feyre recently became the High lady, though, in all the other courts there is no such thing as high lady. The High Lord/High Lady rules his/her province. Such as Tamlin ruling the spring court or Rhysand and Feyre ruling the night court. If there is a war coming or other reasons all the High Lords meet together to discuss the matter.