Eldacar, better known as Thorondûr (S. "Dark-eagle") (T.A. 861-936) was the second son of Eärendur of Arnor (the last King of Arnor), and brother to Amlaith of Arthedain and Galadhion of Rhudaur. He became the first King of Cardolan and was succeeded by his son Turamarth.