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Emperor Taizong of Tang (李世民) died at the age of 51, on July 10, 649 AD.
Born: January 23, 598 AD
Died: July 10, 649 AD
Age at death: 51
Reign: 626–649 AD (23 years)
There is no historical evidence in reliable Chinese records (e.g., Zizhi Tongjian, Old Book of Tang) stating that Emperor Taizong died from excessive sex or from having too many concubines.
This claim is likely a myth or modern exaggeration. While he did have many concubines—as was common for emperors—his declining health in his later years is typically attributed to chronic illness and possibly the long-term effects of military campaigns and stress.
Li Shimin (Emperor Taizong) is widely regarded as one of the greatest emperors in Chinese history, known for:
Stabilizing the Tang Dynasty after its founding
Implementing enlightened policies
Patronizing arts and scholarship
Setting a model for later rulers
Let me know if you want a list of Tang emperors who died young or due to excesses.