In the twelfth year of Zhenguan, the national power of the Tang Dynasty increased steadily, but there were hidden worries: aristocratic families monopolized high-end handicraft skills, and the level of folk craftsmen varied; the trade routes in the Western Regions were beginning to open, and Central Plains utensils were difficult to compete due to rough craftsmanship; in the court, there was an undercurrent between the Guanlong Group represented by Changsun Wuji and the camp of officials from poor families headed by Fang Xuanling, and Li Shimin's test for the prince's throne had begun to take shape.
