text: The Arabs captured Caesarea from the Byzantines in a.d. 639 and the Crusaders conquered the Arabs in 1101 , discovering a green crystal vessel which they claimed to be the Holy Grail , the cup from which Jesus and his disciples drank during the Last Supper ( it now reposes in Genoa ) .
  
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  Caesarea was taken over by the Crusaders in a.d 647 .