Question: Luthien, who appears in Tolkien's companion to The Lord of the Rings, "The Silmarillion", has her story told to Frodo by the heir of Isildur, who was first introduced by what name?
Sentence (from "Lúthien"): Lúthien Tinúviel (Y.T. 1200–Y.S. 503; died aged 3377) is a fictional character in the fantasy-world Middle-earth of the English author J. R. R. Tolkien.
Relevant evidence: Yes