sentences:  Two months later, Emperor Gaozu yielded the throne to Li Shimin, who became emperor (as Emperor Taizong).He initially made Yang Gongren to be the governor of the capital prefecture Yong Prefecture (雍州), and then made him the assistant to the commandant at Yang Prefecture (揚州, roughly modern Yangzhou) -- Emperor Taizong's favorite son Li Tai the Prince of Yue.