Assertion: empire's territory | /r/PartOf | the han and tang empires
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Source sentences:
text: After usurping the throne of the Later Zhou dynasty, Emperor Taizu of Song (r. 960–976) spent sixteen years conquering the rest of China, reuniting much of the territory that had once belonged to the Han and Tang empires and ending the upheaval of the Five Dynasties and Ten Kingdoms period.