Agaldor was a Chieftain and Twilight-walker or Prophet among the Gwathuirim of Enedwaith in the Second Age. He was a friend and ally of Amroth son of Amdír and took part in the battles that drove Sauron out of Eriador, and he prophesied the coming of the Númenóreans and the Salvation of Man, but he was later slain by the Númenóreans who led a punitive expedition against the uprising Folk of Minhiriath.
Agaldor and his story were just a brief sketch never actually fleshed out or finished by J. R. R. Tolkien, as it appears in the Lost Road. In this story also "Amroth" was still a totally different character, the son of Galadriel and Celeborn and Celebrians brother.This Agaldor or Galdor and Amroth were in some ways precursors to the later character of Elendil the Tall.Agaldor also shares some similarities with the later character of Tal-Elmar.
- The Lost Road and Other Writings, "Part One: II. The Fall of Númenor, (i) The original outline", p. 11↑ J.R.R. Tolkien, Christopher Tolkien (ed.), The Lost Road and Other Writings, "Part One: III. The Lost Road, (iii) The unwritten chapters", pp. 86–87