Ilúvatar was the one who created the Timeless Halls within the
Void and the Ainur. He instructed them to sing, and from the result of
their efforts created the Circles of the World which contained Arda. He
also created those we call his children: the firstborn, the Eldar and later
the Atani, or Secondborn. However, he also accepted the race created by
Aulë, the Dwarves.
After that, he rarely interfered with Arda. The only time on record
was at the end of the Second Age of the Sun when he removed the Undying
Lands from within the Circles of the World and reshaped the lands into
Ilúvatar is also called Eru.
Second Age of the Sun | Aulë |
The Timeless Halls | The Void | The
Circles of the World | Arda | Aman