Rúmil of Tirion

Rúmil (Rúmil of Tirion and Rumil of Túna) was Noldorin sage of Tirion. He is not to be confused with Rúmil of Lorien.

Background
He was the first deviser of written characters; to him is attributed the Ainulindalë.

Rúmil of Tirion was the name of the loremaster who first achieved fitting signs for the recording of speech and song, some for graving upon metal or in stone, others for drawing with brush or with pen.

In his youth, Fëanor improved on the work of Fëanor.

Behind the scenes
Rúmil's devised writing is mentioned in LOTR appendix. The index for Lord of the Rings seems to treat both Rúmil's as the same character, however other sources treat them as separate characters. Also it seems Rúmil never left Valinor or least has never left as far as Tol Eressëa (he is treated as one of the individuals that Ælfwine has interviewed there, or at least translated his works as maintained by Pengolod.