Eärendur was the tenth, and last, High King of Arnor. We have no information about his rule, save that upon his death in TA 861, due to dissensions among his three sons, the kingdom of Arnor was ended. The lands were divided into three separate kingdoms: Arthedain, Rhudaur, and Cardolan.

The rule of Arthedain was committed to Eärendur's eldest son and heir, Amlaith.
Encyclopedia entry originally written by atalante_star