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William of Newburgh's Chronicle of 1290AD is said to mention the sighting of a round silvery object flying over the Byland Abbey in Yorkshire.
According to most historical sources William of Newburgh lived from 1136-1201, out of the time scale for him to have recorded it. He did write a book called 'Historia Rerum Anglicarum', which contained many tales of the varied beliefs of the time. This may have been the original source of the story, which has been repeated several times in literature.