Ilúvatar was also the only name of God used in earlier versions — the name Eru first appeared in "The Annals of Aman", published in Morgoth's Ring, the tenth volume of The History of Middle-earth.
Morgoth, sometimes referred to as Melko/Melkor, in J. R. R. Tolkien's Middle-earth legendarium
In Morgoth's Ring, Tolkien states that Saruman did interbreed orcs and men, resulting in "Man-orcs large and cunning, and Orc-men treacherous and vile."
After the catastrophe of the Fifth Battle, the Nírnaeth Arnoediad, the boy Túrin is sent to Doriath for protection from Morgoth's special enmity for the House of Húrin.
"The Devil with The Three Golden Hairs" is noted to have influenced J. R. R. Tolkien's The Tale of Beren and Lúthien, in which the elf-king Thingol sets an impossible task for his daughter's mortal suitor: to obtain one of the three Silmarils from the Iron Crown of Morgoth.
Her conflict with Morgoth over the Silmaril was the subject of Blind Guardian's song "Into the Storm", from their 1998 album Nightfall in Middle-Earth.