J.R.R. Tolkien created many languages throughout his life. He wrote in one of his letters that the tales of Middle-earth (The Hobbit, The Lord of the Rings, The Silmarillion, etc) grew from these languages, rather than the languages being created for use in the stories.
Tolkien also created a number of different alphabets to write his languages – Tengwar, or Feanorian letters, is the one which appears most frequently in his work. The way the vowels are indicated in Tengwar resembles Tibetan and other Brahmi-derived scripts.
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