By improving gunpowder technology, he was appreciated by Li Shimin and skillfully resolved the first confrontation with Wu Zetian. He became a blockbuster at the Qujiang Poetry Festival and formed an indissoluble bond with Shangguan Wan'er. On his deathbed, Li Shimin entrusted him with the imperial seal, and Li Yan swore in front of Lingyan Pavilion to protect the Tang Dynasty forever. The imperial examination system was reformed and the Military Aircraft Department was established, laying the foundation for a prosperous era.
Very good, wonderful content
A good book with coherent content