He was born in Karrlakton, starting its reputation as the birthplace of kings.
Around -2,000 YK, Karrn established Karrnath and tried to conquer all Khorvaire and unite the other human nations of the time under his rule, though without success. He also defeated the remaining goblinoid settlements.
He created the prison island of Dreadhold as a place of exile for deposed rulers and disgraced courtiers.