Saladin's sense of humor

Ibn Abi Usaibia, a physician from the Ayyubid period in the 13th century, tells a story of Saladin's encounter with a haughty doctor: 

Someone who knew well Ibn al-Mutrān's conceited nature and arrogance told me that he once accompanied the sultan on one of his military expeditions. In time of war, during campaigns, it was Saladin's habit to occupy a red pavilion, complete with a red outer tent and vestibule. One day, when Saladin was out riding, he saw a red tent with a red vestibule and privy. He contemplated it for a while and then asked whose it was. Upon being informed that it belonged to the physician Ibn al-Mutrān, he said, 'By God, I knew it was some stupid freak of Ibn al-Mutrān's!' He laughed, but then said, 'What would happen if a messenger were to ride by and think that it belonged to a king? If he must have his tent, he shall change the privy,' and he ordered it to be destroyed. When this was done, Ibn al-Mutrān took it very hard, keeping to himself for two days and not providing his usual services, but the sultan mollified him with a gift of a purse.

The same source also informed me that there was in the service of Saladin a Christian physician by the name of Abū l-Faraj al-Nasrānī who served the sultan for a time and frequently visited his palace. One day he told the sultan that he needed dowries for his daughters and asked him for his assistance in this matter. Saladin replied, 'Write down on paper everything that you require and bring it to me.' Abū l-Faraj left and listed on a piece of paper jewellery, fabrics, utensils, and other things to the value of 30,000 dirhams. When Saladin read the list, he ordered his treasurer to buy everything for Abū l-Faraj, leaving nothing out. No sooner had Ibn al-Mutrān heard about this than his attendances on his master became surly and sporadic. Saladin noticed that his physician's face had changed and understood the reason. Then and there he ordered his treasurer to calculate the price of everything that he had bought for Abū l-Faraj. When the treasurer had calculated the total amount, Saladin ordered him to pay Ibn al-Mutrān a similar sum, and that was duly done.