The One Ring was lost when Isildur was attacked by Orcs. Isildur tried to escape, but he was killed when he lost the Ring. In the Third Age, the Ring was found by the Stoor hobbit Déagol, who was killed by his friend Sméagol over the Ring. Sméagol went to live under the Misty Mountains, where he kept the Ring for five hundred years, and he became known by the name Gollum. 