Description:
Elendur was the son of Valandur, and became the ninth king of Arnor at his father's premature death. He assumed the throne at the age of 100.
Lord of the Rings: Return of the King Appx. A Part I Section ii "The Realms in Exile" HoME 12: The Peoples of Middle-earth Part 1"VII The Heirs of Elendil”