Seven Kingdoms: Seowyn's Crossing
Esavol (or Esavola for a female) is the title given to the ruler of the Eladrin-in-Exile of Tavanion. The title is not hereditary. During their lifetime, an Esavol is expected to choose three worthy heirs. After the death of an Esavol, the three heirs compete in ancient Trials of Worth to see which of the three can claim the rulership of Tavanion. If none are found worthy by the Trials, then the knights of Tavanion go on long quests through the Feywild, looking for signs as to who will be their next ruler.
At the time of the founding of the Seven Kingdoms, Shalana Silvermyst was Esavola of her people.