Established by Emperor Gaozu, the Han dynasty lasted much longer than the precedent that came before it of the short lived Qin Dynasties and the even shorter lived Chu dynasty. Empress Dowager Lu survived after Gaozu's death from illness and had her second son made Emperor in the year 547 (206 BC). His reign, as Emperor Hui 惠, was rather uneventful with things progressing as normal within his administration. Outside of his court however these were revolutionary times in the Han Empire. The Printing press, porcelain, and the smelting of cast iron were all innovations from around of after the time of Emperor Hui. The ideas of Sun Tsu on the Art of War spread throughout the east asian world as well as did literacy, following the standardization of the Sinican Language by Qin Shi Huang earlier