The Tale of the Wazir and the Sage Duban
Once upon a time, a King called Yunan reigned over a city in Persia. He was a powerful and wealthy ruler, who had armies and guards and allies of all nations of men; but his body was afflicted with a leprosy which philosophers and men of science failed to heal. He drank potions and he swallowed powders, but naught did him good and no physician was able to procure him a cure.
At last there came to his city a mighty healer of men, the sage Duban. This man was a reader of books, Greek, Persian, Roman, Arabian, and Syrian; he was skilled in astronomy and the wisdom of the ancients; conversant with the virtues of every plant, grass and herb, as well as philosophy and the whole range of medical science.
Now this physician had heard of the King's malady and all the bodily sufferings with which Allah had smitten him and how all the doctors and wise men had failed to heal him. Upon this he sat up through the night in deep thought and, when the dawn broke he donned his handsomest dress and betook himself to King Yunan, kissing the ground before him. He called down blessings on the King, saying: