Brandon Stark (the Breaker)

A ​member of House Stark is an unseen character in Game of Thrones. He is long dead by the time in which the show takes place. He was a King in the North during the Age of Heroes.

Biography
According to legend, he allied with King-Beyond-the-Wall Joramun do defeat the Night's King and the Night's Queen, freeing the Night's Watch from their rule.

In the books
In the A Song of Ice and Fire novels, little is known about the King in the North who helped Joramun defeat the Night's King. In some versions of the tale, he is the brother of the Night's King.