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In page Charlemagne:

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His Capitulary for the Jews, however, was not representative of his overall economic relationship or attitude towards the Frankish Jews, and certainly not his earlier relationship with them, which evolved over his life. His personal physician, for example, was Jewish,[2] and he employed one Jew, Isaac, who was his personal representative to the Muslim caliphate of Baghdad.[3] Letters have been credited to him that invited Jews to settle in his kingdom.[4][5][6]