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This sounds to me like an apocryphal story rather like the story that over Plato's Academy there was a sign saying 'let no-one ignorant of geometry enter here'. It's most likely a story dreamt up by mathematicians to promote the study of mathematics. I wouldn't put much credence in it.


This is a semi-legendary story with shifty details told to showcase Frederick's enlightened ways with Muslims and intellectual prowess. There might be some historical basis to it, although Muslim historians had reasons to exaggerate and embellish considering how friendly Frederick was compared to other Christian crusaders. In any case, the original sources ...

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