Who created the spirits named the Ainur in the History of Arda?
Eru Ilúvatar created the spirits named the Ainur from his thoughts. He made divine music with them to symbolize the history of the whole universe.
Questions about History of Arda
Short answers, pulled from the story.
When did the Valar enter Arda and what was its initial state?
The Valar entered Arda when it was still lifeless without distinct geographical features. The world was originally symmetrical and lit by misty light that veiled the barren ground.
What happened during the Years of the Trees in the History of Arda?
Yavanna made the Two Trees named Telperion and Laurelin which illuminated Valinor while Middle-earth remained dark. This period included the Days of Bliss where peace and prosperity filled Valinor before the first Elves awoke in Cuiviénen.
How did Melkor destroy the Lamps of the Valar in the History of Arda?
Melkor returned to Arda creating his fortress of Utumno beneath the Iron Mountains in the far north. He assaulted and destroyed the Lamps of the Vala Aulë which were Illuin and Ormal set upon Helcar and Ringil.
Why was Númenor utterly destroyed in the History of Arda?
Ar-Pharazôn invaded Aman after being deceived by Sauron who promised him immortality. When the King's forces set foot on Aman the Valar laid down their guardianship and Ilúvatar intervened to change the world into a sphere.