Nicholas Sayre is a fictional character from the Old Kingdom series, a popular fantasy book series written by Garth Nix. He is introduced in the novel Abhorsen and is known for his intelligence and resourcefulness. Nicholas is a young man who becomes involved in the complex world of magic and the afterlife, navigating challenges that test his courage and determination. In the series, Nicholas is closely associated with the character Lirael, a powerful necromancer. His journey involves learning about the responsibilities that come with magic and the importance of friendship and loyalty. Throughout the story, Nicholas grows as a character, facing both external threats and personal dilemmas.