The early trailers for Guy Ritchie's King Arthur: Legend of the Sword (2017) were released last (northern) summer, which means my favourite season in life as a medievalist academic is coming: the season of The Truth About King Arthur. It doesn't matter if the movie itself is good or bad: the question I will be getting is “but how accurate is it?” Does it represent the “real” legend of King Arthur? This short piece for non-specialist readers surveys the origins of Arthurian legend and some of the reasons we love retellings of well-known stories.