Aspects of this topic are discussed in the following places at Britannica.
...he was murdered by members of his entourage at Jiangdu. However, by 617 the real powers in China had become the various local rebels: Li Mi in the area around Luoyang, Dou Jiande in the northeast, Xue Ju in the far northwest, and Li Yuan (who remained nominally loyal but had established a local position of great power) in Shanxi. At the beginning of 617, Li Yuan inflicted a great defeat on the...
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