Lambengolmor
From Tolkien Gateway
The Lambengolmor were the Loremasters of the Elves. They were skilled linguists and historians, and created many works about the Elves and their languages.
Known members were Rúmil, who invented the first alphabet, Fëanor, who invented the Tengwar, and Pengolodh, who is credited with many works that are the basis for The Silmarillion.