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In page The Last Supper (Leonardo):
"Leonardo worked on The Last Supper from about 1495 to 1498, but did not work it continuously. The beginning date is not certain, as the archives of the convent for the period have been destroyed. A document dated 1497 indicates that the painting was nearly completed at that date.[3] One story goes that a prior from the monastery complained to Leonardo about its delay, enraging him. He wrote to the head of the monastery, explaining he had been struggling to find the perfect villainous face for Judas, and that if he could not find a face corresponding with what he had in mind, he would use the features of the prior who had complained.[4][5]
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