The Lord Ruler is a central character in the fantasy series Mistborn by Brandon Sanderson. He is depicted as a powerful and immortal figure who has ruled the world for over a thousand years. His reign is marked by strict control over the population and the use of magic known as Allomancy. The Lord Ruler is both feared and revered, embodying the complexities of tyranny and leadership. Originally a hero who defeated the Deepness, the Lord Ruler later became a tyrant, enforcing a harsh regime. His rule is characterized by the oppression of the Skaa, the lower class, while the Nobles enjoy privileges. The story explores themes of power, rebellion, and the consequences of absolute authority through his character.