Filavandrel aén Fidháil/Netflix series

Filavandrel aén Fidháil is the king of the elves. He and his people were forced to retreat into the mountains after a war with the humans.

Capturing a Witcher
Filavandrel, king of the elves, Torque, and Toruviel confront Geralt of Rivia and Jaskier after apprehending them in the mountains. Torque has been stealing goods for them ever since they were forced out of Dol Blathanna. This comes as a surprise to Jaskier, who has been under the impression that the elves willingly left to return to their "golden palaces," when in reality they retreated to simple caves. Unfortunately, they can’t allow Geralt and Jaskier to leave in fear that Posada will learn that they’ve been stealing, causing the humans to attack, which will undoubtedly result in casualties on both sides. To avoid war, Filavandrel must kill them.

Geralt advises that Filavandrel bring his people out of the caves, however, he explains that his elders worked with humans and got robbed of all they had. And when they fought back, they were slaughtered in a battle that would come to be known as the "Great Cleansing." Bringing his people down from the mountains would mean bowing down to the humans, who would make them slaves. Geralt advises them to rebuild elsewhere and grow in numbers. Toruviel informs Filavandrel how a new generation of elves who wish to fight have come. She’d rather bring war to the humans than live cowering from them. Instead, Filavandrel decides to let Geralt and Jaskier go.