The Night King

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The Night King is a recurring character in the fourth, fifth and sixth seasons. He is played by guest star Richard Brake in the fourth and fifth seasons, and by professional stunt performer Vladimir Furdik onwards. He first appears in "Oathkeeper". He is the leader of the White Walkers and the first of his kind, having existed since the age of the First Men.

Before he became a White Walker, the Night King was a First Man that was captured by the Children of the Forest, Leaf among them. Leaf pressed a dragonglass dagger into his chest, causing his eyes to turn blue and turning him into the first of the White Walkers. Thousands of years later, Leaf tells Bran Stark that her people created the White Walkers to defend themselves when Westeros was invaded by the First Men, who were cutting their sacred trees and slaughtering the Children of the Forest.

The Night King is a legendary figure, known by name among, at least, some noble houses in the North.