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There is an interesting argument to be made that the Arthurian Legends are post-apocalyptic dystopian narratives. After the Romans pulled out of England, they left behind cities with advanced plumbing, great roads, defensive walls, and up-t0-date naval ports. No people who were left behind, however, knew how to maintain any of this stuff. As the pipes stopped working the bath houses and barbarians overran the roads, the economy collapsed and the land fell into chaos. The plantations which had previously produced cash crops began instead producing their own foodstuffs and training their personnel for self-sufficiency. This was the genesis of feudalism in Middle Age Europe. Since no one could field huge armies anymore, militias became centered around powerful single warriors with the best equipment, knights. Think Mad Max but substituting horses for motorcycles. Many warlords arose who attempted the reunite England under a single authority for several benefits like reduced in-fighting, better defense against invaders, and improved economics. Arthur Pendragon was the first of these warlords who actually achieved this goal.
Seen from this perspective, all of the Arthurian Legends seem quite different. For example, look at Sir Gawain and the Green Knight. As a simple fairy tale, Gawain confronts a knight who turns out to be an incarnation of nature, dying and being reborn every Spring. Gawain learns something about nature and becomes wiser for it. As a post-apocalyptic story, Gawain is idealistically trying to help Arthur rebuild the glory of the civilization that was lost. The Green Knight is really talking about the rise and falls of societies, telling Gawain that Camelot will achieve its goals but only to inevitably crash down again into anarchy. Instead of a story about rebirth, the moral is downright nihilistic.