The bloodlines of Anárion and Isildur were reunited by the marriage of Anárion's descendant, Fíriel of Gondor, with Isildur's descendant, Arvedui of Arthedain.
Cardolan recognised therefore the overlordship of Arthedain, though Rhudaur gave its loyalty to the Witch-king and Angmar which led to long hostilities, although most of the Dúnedain of Rhudaur left for Cardolan and Arthedain.