Answer: There seems to be no one named Sima Cang in history. There was a man named Sima Guang in the Western Han Dynasty. He is a great man, historian, writer and thinker. He wrote China's first book Historical Records. In the Northern Song Dynasty, there was a man named Sima Guang, a politician and historian. The story of Sima Guang smashing a jar is widely known so far.