Arnor - The North Kingdom of the Dunédain (descendants of the Númenoreans). Arnor was founded in the the Second Age, after the destruction of Númenor. Its first ruler was Elendil, who was high king of both Arnor and Gondor. The tenth king of Arnor, Earendur, split the realm between his three sons, so it later comprised Arthedain, Cardolan, and Rhudaur. Cardolan and Rhudaur became overtly allied with Angmar, the realm of the Witch-King in the Third Age.