Answer: His mother
Explanation:
Tolkien had learned and loved languages because of his mother. She taught him French, German and Latin language at home and in school he had studied the Greek language.
He had a passion for literature and languages from the time when he was a little boy and his mother had a big influence on him.
Because of his passion, he later decided to study great literature.
His mother died when he was only 12 years old.