The Conquest of Korea
•The Tang emperors conquered Korea for China for the second time.
•In the process of conquest,the Tang allied themselves with Silla in order to defeat the other two dynasties.
•When Silla proved resistant to external control, the Tang emperors agreed to recognize the Silla monarch as a vassal in return for the payment of tribute.
•The Chinese withdrew their armies from Korea in 668C.E., leaving the kings of Silla as independent rulers.