This is a common thread to the human condition and I've seen it in both the modern and the historic context.
Look at the "Druidic" revival of the Victorian/Edwardian era associated with Stonehenge. It was (is) based on not much more than wishful thinking and romantic ideas which have since been given a different light by historians.
Modern Western culture is not unaffected by any means. Look at the romanticization of (in America) The Alamo, the Bowie Knife, Rapier (via "Zoro" and "The Three Musketeers"), etc.
Modern Western Martial Arts is rife with the phenomenon, especially "Knightly" arts, and has to compete with LARP, D&D, and the like. On the positive side, however, organizations such as the SCA have managed to (recently anyhow) combine a bit of romantic fantasy with an opportunity for honest scholarship and is frequently a launching point for deeper study in WMA.
Peace favor your sword,