"Lord Paramount" is a title in the Seven Kingdoms of Westeros. It was created during the War of Conquest three centuries before the War of the Five Kings. It is a hereditary title bestowed upon the head of a Great House charged with ruling one of the nine administrative regions of the Seven Kingdoms. They rule their region on behalf of the Iron Throne, the absolute ruler of the Seven Kingdoms. When Robert Baratheon became king after Robert's Rebellion, he kept the Lords Paramount system intact.