In the third year of Zhenguan of the Tang dynasty (629), Emperor Taizong of Tang ordered Fang Xuanling to supervise the completion of the Book of Sui, which was being compiled around the same time as other official histories were being written. The Book of Sui was completed in 636 AD, the same year as the Book of Chen was completed.
During the third year of Emperor Taizong's reign in the Tang dynasty (629), he ordered Fang Xuanling to oversee the completion of the Book of Sui, which was being compiled alongside other official histories at the time. The Book of Sui was finished in 636 AD, the same year as the Book of Chen was completed.