John Ronald Reuel Tolkien (JRRTolkien) was a philologist in the strict sense of the term. This term, philologist, derives from the Greek [φίλος (philos) and λόγος (logos)] and literally means 'love of words'. According to the Oxford Dictionary, it is “the scientific study of the development of language or a particular language,” which is precisely what Tolkien did throughout his life. Tolkien was, as has been said, a profound lover of words, which he began to develop from an early age. In 1900, when he had to move with his family to Birmingham to be closer to King Edward's School, Tolkien discovered Gaelic, a language in which he showed great interest and which "opened him to another linguistic world" ("le abrió otro mundo lingüístico”, Carpenter, 2002:37). When he returned to King Edward's, after a year at St. Philip's School, he began to learn Greek; he already knew Latin as his mother had taught him at home. When his literature teacher read The Canterbury Tales, by Geoffrey Chaucer, in the original Middle English “he decided to learn more about the history of language” (Carpenter, 2002:39), “why languages ​​are the way they are” (“ por qué eran como eran” Carpenter, 2002:46). The discovery of Anglo-Saxon was also an important element in his approach to philology. As can be seen, his encounter with these 'new-old' languages ​​was continuous: Old Norse, Gothic, etc. It was also the starting point of his creation of private languages ​​(Naffarin). Thanks to his in-depth study of these languages ​​we have today works such as The Silmarillion, The Hobbit or The Lord of the Rings, since Tolkien's imagination did not come from anywhere else but from the language itself, as Segura (2008) states by saying that “ his imagination was... made of paper ......o.-Carretero, M.-“Catastrophe”. Oxford Student Dictionaries. 2014. http://www.oxfordlearnersdictionaries.com/definition/english/catastrophe-Coleridge, S.T. 1984. Biographia Literaria. P.6. Princeton: Princeton University Press.-“Eucatastrophe.” Oxford dictionaries, language matters. 2014. http://www.oxforddictionaries.com/es/definicion/ingles/eucatastrophe-Lewis, CS 2002. On stories and other essays on literature. EE.UU: Mariner Books.-Segura, E. 2008. JRRTolkien: Mitopoeia y Mitología, reflexiones bajo la luz refractada. Spain: Portal Editions.-Segura, E. 2001. El Viaje del Anillo: Mapa narrativo de la Tierra Media.-Tolkien, JRR (lecture given in 1939). On fairy tales.-Tolkien, JRR 19??. The Lord of the Rings: The Two Towers.-Olsen, C. 2010. On fairy tales. http://www.festivalintheshire.com/journal5hts/5tolkienprofessor.html