Gwanggaeto the Great
During his early reign, Jangsu dedicated much of his efforts toward stabilizing an empire that had experienced great and sudden growth as a direct result of his father's conquests. Jangsu built a magnificent tomb for his father, Gwanggaeto the Great, and along with it an imposing 6 meter tall tombstone engraved with his father's accomplishments (now known as the Gwanggaeto Stele).