Thorondor was sent by Manwë, King of the Valar, to watch over the Ñoldor after they arrived in Beleriand. The Eldar first encountered him when he helped Fingon rescue Maedhros from imprisonment from Thangorodrim, upon which he had apparently made his home for a short time. After that, Thorondor and the rest of the Eagles settled in the Crissaegrim. When Gondolin was built, Thorondor became the ever vigilant guardian of the city. He rescued Fingolfin's body from defilement after Morgoth killed him, giving the Dark Lord a scar on his face. He, Landroval, and Gwaihir rescued Beren and Lúthien when Angband was aroused.
In Tolkien's writings, Thorondor is not mentioned after the War of Wrath. It is believed he returned to Valinor, although his descendants remained behind. Gwaihir became the Lord of Eagles in Middle-earth after Thorondor's departure.
|Foreign Language||Translated name|
|Chinese (Hong Kong)||索隆多|
|Kazakh||Тһорондор (Cyrillic) Thorondor (Latin)|
|Serbian||Тхорондор (Cyrillic) Thorondor (Latin)|
|Uzbek||Тҳорондор (Cyrillic) Thorondor (Latin)|
- The History of Middle-earth, Vol. IV: The Shaping of Middle-earth, chapter III: "The Quenta"
- The Silmarillion, Quenta Silmarillion, Chapter XIII: "Of the Return of the Noldor"
- The Silmarillion, Quenta Silmarillion, Chapter XVIII: "Of the Ruin of Beleriand and the Fall of Fingolfin"
- The Silmarillion, Quenta Silmarillion, Chapter XIX: "Of Beren and Lúthien"
- The Silmarillion, Quenta Silmarillion, Chapter XXIII: "Of Tuor and the Fall of Gondolin"
- The Silmarillion, Quenta Silmarillion, Chapter XXIV: "Of the Voyage of Eärendil and the War of Wrath"
- The Silmarillion, Appendix: Elements in Quenya and Sindarin names
- The History of Middle-earth, Vol. 5: The Lost Road and Other Writings, Part Three: "The Etymologies"