Sauron, the Dark Lord, had made the One Ring, a Ring of Power, to enable him to take control of the whole of Middle-earth. Isildur and his brother Anarion, and their father Elendil, joined the Last Alliance of Elves (under Gil-Galad) and Men against Sauron. They defeated him at the Battle of Dagorlad, and laid siege to Sauron's Dark Tower, Barad-dûr, in Mordor. After seven years, Sauron came out to challenge Isildur. During the final battle on the slopes of Mount Doom, Elendil and Gil-galad were both killed. Isildur took up the hilt-shard of Narsil, Elendil's sword, and cut the One Ring from the hand of Sauron. Despite the urging of Elrond and Círdan, Gil-galad's lieutenants, Isildur did not throw the Ring into the fires of Mount Doom. The Second Age ended, and Isildur became King of both Arnor in the North and Gondor far away in the South. Isildur was killed by orcs soon afterwards at the Gladden Fields beside the River Anduin, and the Ring was seemingly lost for ever.