The Lion sculpture has had a very long and obscure history, probably starting its existence as a funerary statue called zhènmùshòu (镇墓兽 in Simplified Chinese, literally “tomb guardian”) in medieval China, during the reign of the Tang Dynasty.
...The Lion, in its present form, is a composite of different pieces of bronze created at very different times, building upon ancient "core" components. It has undergone extensive restoration and repair work at various times.
...More recent studies, however, suggest that the statue likely comes from the regions near the lower course of the Yangtze River, in eastern China, and was probably cast sometime in the period from the 7th to the early 10th century CE, during the reign of the Tang Dynasty. The original bronze figure, taken as a whole, was likely significantly different from the Lion of today...