Valandil (King of Arnor)
From Tolkien Gateway
Youngest of Isildur's four sons. He was only a child at the time of the War of the Last Alliance, and so remained in Imladris when his father and brothers went into the south. Because of this, he was the only one of Isildur's sons to survive the Disaster of the Gladden Fields. He eventually became the third King of Arnor, and was succeeded by his son Eldacar.
