Answer:
The Tang Dynasty was founded by Li Yuan, a military commander who proclaimed himself emperor in 618, after suppressing a coup by the guards who assassinated Emperor Sui, Yangdi (r. 614-618). Although Gaozu (reigning name of Li Yuan) was the first of the Tang emperors, it was under his son Taizong (r. 624-649) that the Tang dynasty consolidated its power and began to achieve an internal peace that would last almost three centuries. interrupted only by the nine years of the An Lushan rebellion (755-763).
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