Eru Ilúvatar
J. R. R. Tolkien included as a note to his comments about the "Dialogue of Finrod and Andreth" (published posthumously in 1993) the Tale of Adanel that is a reimagining of the fall of man inside his Middle-earth's mythos. The story presented Melkor seducing the first Men by making them worship him instead of Eru Ilúvatar, leading to the loss of the "Edenic" condition of the human race. The story is part of "Morgoth's Ring".