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Writing in c.1223 about the murder of Arthur of Brittany by King John, William le Breton notes that "The sea rises and falls at the times dictated by the Moon". How did early medieval minds know this? Or was it simply an observation that was linked through pattern?

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Writing in c.1223 about the murder of Arthur of Brittany by King John, William le Breton notes that "The sea rises and falls at the times dictated by the Moon". How did early medieval minds know this? Or was it simply an observation that was linked through pattern?	191