The White Tree of Tirion was the holiest symbol of the Calaquendi elves of Eldamar. In Sindarin, it was known as Galathilion ("Radiant-Holy-Moons").

The tree was made by Yavanna, and was created in rthe image of Telperion, one of the Two Trees of Valinor. It grew beneath the Tower of Ingwë in a high, open courtyard, but unlike Telperion, the White Tree of Tirion gave forth no light.

Galathilion's descendant was Celeborn, the White Tree of Eressëa.
Encyclopedia entry originally written by atalante_star