In 58 1 year, Emperor Wendi of Sui Dynasty usurped the Northern Zhou Dynasty and proclaimed himself emperor, with the title of Da Sui. After eight years of preparation, in 589, Emperor Wendi of the Sui Dynasty ordered the destruction of Chen, which ended the separatist regime from the end of the Eastern Han Dynasty to the Sui and Tang Dynasties for more than 400 years and reunified China, which had been in war for more than 400 years.