Abstract
SUMMARY: The colour-theory in Western-Europe from ca 600-1200 is restricted to a few remarks in the works of e.g. Isidore of Seville (ca 560-636), Beda (674-735), Hrabanus Maurus (776-856), William of Conches (1080-1145) etc. What they write has generally to do with the rainbow. Isidore of Seville described the fact,
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