Isildur (Quenya: [iˈsildur]) is a fictional character in J. R. R. Tolkien's Middle-earth, the elder son of Elendil, descended from Elros, the founder of the island Kingdom of Númenor. He fled with his father when the island was drowned, becoming in his turn King of Arnor and Gondor. He cut the Ring from Sauron's hand, but instead of destroying it, was corrupted by its power and claimed it for his own. He was killed by orcs, and the Ring was lost in the River Anduin.
https://en.wikipedia.org/wiki/Isildur