Heart-Shaped Book
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It kind of makes sense to put love poetry in a heart-shaped book. Still, very few of them survive. Medieval paintings show actual readers prominently showcasing their heart-shaped books, suggesting it must have been a tradition. Copied in the sixteenth century, this particular one from the Danish National Library is the oldest manuscript with love ballads in Danish vernacular.
More strange medieval books at the source: http://medievalbooks.nl/2014...
More strange medieval books at the source: http://medievalbooks.nl/2014...