Not surprisingly, The Book of Kings is now the national epic of Iran, and I wonder if it was actually the cost of the book that gave the sultan pause: maybe he didn’t like seeing Turks presented as the bad guys of history. Firdausi also heaped scorn on the Arabs and devoted a long passage at the end to detailing their primitive savagery as compared to the civilized grace of the Persians at the time Islam was born.