Argeleb I succeeded his father, Malvegil, as the seventh King of Arthedain in T.A. 1349.He was both an accomplished scholar and a fine fighter. His reign marked the begining of Arthedain's claim to Cardolan and Rhudaur. When Argeleb ascended the throne in Fornost, no heirs of Isildur remained in either state and Angmarrim occupied Rhudaur. So, Argeleb declared himself King of Arnor, aggravating many of the petty Princes in Cardolan and sparking a war with the Witch-king. The Arthadan King fortified his frontiers and erected towers atop the Weather Hills, but he was slain in battle by warriors from Rhudaur in T.A. 1356.