"The kings of China have stated that the kings of the world are five in number and all the people of the world are their subjects. They mentioned the king of China, the king of India, the king of the Turks, the king of the Furs (Persians) and the king of the Romans (1). They referred to the king of China as the "king of humans" because the people of China are more obedient to authority and are stronger followers of government policies than all the other peoples of the world. They referred to the king of India as the "king of wisdom" because of the Indians careful treatment of `ul?m (sciences) and their advancement in all the branches of knowledge. They referred to the king of the Turks as the "king of lions" because of the courage and the ferocity of the Turks. They referred to the king of Persia as the "king of kings" because of the richness, glory and importance of his kingdom, since Persia had subdued the kings of the center of the populated world, and because it controlled, to the exclusion of other kingdoms, the most fertile of the climatic regions. And they referred to the king of the Romans as the "king of men" because the Romans, of all the peoples, have the most beautiful faces, the best built bodies and the most robust physique."