Mance Rayder is a fictional character from the book series A Song of Ice and Fire by George R.R. Martin. He is known as the "King-Beyond-the-Wall," leading the Free Folk, a group of people living north of the Wall in the land of Westeros. Mance is a charismatic leader who unites various clans to face the threat posed by the White Walkers. Mance Rayder's character is introduced in the first book, A Game of Thrones, and plays a significant role in the later parts of the series. He is portrayed as a skilled strategist and a fierce warrior, embodying the spirit of freedom and resistance against the oppressive forces of the Night's Watch.