ed a successful coup in 265 and founded the Jin Dynasty。 By 280 he had reunited the north and south； but unity was only temporary； as the Jin princes began fighting among themselves。 The non…Chinese groups of the north seized the opportunity to attack； and by 317 the Jin had lost all control of North China。 For the next 250 years； North China was fractured and ruled by numerous non…Chinese dynasties； while the south was ruled by a sequence of four short…lived Chinese dynasties； all centered at present…day Nanjing ＇the city of Shidou； in Jianye＇。〃 （from Encarta Encyclopedia）。
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