The seller most likely knew that Aryeh was Jewish because D. Jews in his day were required to wear distinctive clothing.
There was a lot of anti-Semitism in Europe during the Middle Ages because Christians blamed them for the death of Jesus Christ.
As a result, Jews were regularly subjected to harsh treatment such as :
Conclusively speaking therefore, Aryeh was most probably wearing something that showed he was a Jew such as a hat.
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