Isildur

The elder son of Elendil, Isildur was one of the Faithful who survived the Akallabeth of Númenor. Prior to his departure, he made his way into the palace courtyard at Armenelos and stole a fruit of Nimloth the White Tree. He suffered grievous injury but slipped away to recover, and thus assured the survival of the tree's line. He escaped from the Downfall, and in the cataclysm his ship —and that of his brother Anárion — were both driven southwards towards the Bay of Belfalas. The vessels bearing their father Elendil and his retainers went North, towards Eriador and Lindon. Isildur and Anarion founded the Kingdom of Gondor and ruled jointly from Pelargir, and then Osgiliath. Isildur later built the fortified hill-city of Minas Ithil and was Lord of Ithilien until S.A. 3429, when Sauron's forces invaded Gondor and seized his home town. He fled to Arnor to gather an army, and soon returned to aid his beleaguered brother. Isildur stood with his father and the Elven High-king Gil-galad as they faced Sauron on the slopes of Orodruin in S.A. 3441. Both Elendil and Gil-galad fell before the might of the Dark Lord, but their deaths were not in vain. As the Evil One broke Narsil and struck down Elendil the Tall, Isildur grasped the hilt-shard of the sword and cut the Ruling Ring from Sauron's burning hand. His focus of power stripped away, the Dark Lord could not retain his form. He passed into the Shadows. As the sole surviving Dúnadan King after the War of the Last Alliance (Anarion was killed outside Barad-dur in S.A.  3440), Isildur returned with the Ring of the Dark Lord to Minas Anor. He ruled Gondor for two years and then set off for his father's capital at Annúminas in Arnor. It was on his journey north to take the throne of Arnor that he was ambushed by Orcs. In the ensuing Battle of Gladden Fields (T.A. 2), Isildur lost the One Ring, as well as his life.

Isildur's Principal Items:
As heir of Elendil, Isildur was the High-king of the Dunedain after SA. 3441 and owned the hereditary items associated with that office. what would surely have befallen him eventually had he lived. The Ring would have tempted him to use it and, in the end, he would have been overcome by its evil  seduction.
 * Crown-helm— (Helm of Isildur) silver-and ivory-inlaid black ithilnaur (mithril alloy) helmet of a Karma design, shaped like a stylized fish with a prominent ridge of whitish scales.It served as  one of the two Crown-helms  of Gondor.  After S.A. 3440, it was the sole Crown-helm.
 * Elhach — ("Star-flame") mithril sword, glew with a bright white light,
 * The One Ring — Although Isildur possessed the One Ring for nearly two years, he almost never wore it and certainly did not test its powers. It was perhaps more merciful that he died, betrayed by the Ring, rather than lived to endure