Transition from Sui to Tang

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A unity war against the armed separatist regimes established in various parts of the Central Plains in the late Sui Dynasty after the establishment of the Tang Dynasty.

Chronology

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June 618: In winter 617, Li Yuan occupied Chang'an, relegated Emperor Yang to the position of Taishang Huang or retired emperor, and acted as regent to the puppet child-emperor, Yang You. On the news of Emperor Yang's murder by General Yuwen Huaji on June 18, 618, Li Yuan declared himself the emperor of a new dynasty, the Tang.

January 618: 618-628: a unity war against the armed separatist regimes established in various parts of the Central Plains in the late Sui Dynasty after the establishment of the Tang Dynasty .