the tales of ise
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forbidden colours: These refer to colours that only people of special rank, or those with permission to do so, could wear. Since the lady was a favourite of the emperor, she would have been allowed to wear deep red and purple.
[…]
It was customary to avoid mentioning the actual names of emperors and members of the high nobility. As a result, they were often referred to by the name of the place where they lived or had been buried.
