Because of its connection with the chivalric age, medievalism almost always has a political message [...]. Many authors use it conservatively, to promote a wished-for return to a mythical past of peace. This is the case in C.S. Lewis’s The Lion, the Witch and the Wardrobe, where the symbol of the redemption of Narnia is the castle of Cair Paravel once again inhabited by a High King. Lewis’s friend, J.R.R Tolkien, in The Hobbit and The Lord of the Rings, insisted that evil is real and must be combated by even the most lowly1. Star Wars argues that a return to chivalric codes by those destined to be Jedi knights is the only way to save the universe.
The Greenwood Encyclopedia of Science Fiction and Fantasy: Themes, Works and Wonders, Vol. 2, Gary Westfahl, 2005.