The Inventor Of The Stirrup

According to murals and other cultural relics unearthed in Mobei, the Xiongnu people may be the first people to use stirrups. However, the invention and innovation of the stirrup, in the end, was invented by the equestrian people for the convenience of riding, or was invented by the non-equestrian people for the convenience of mastering the riding skills for cavalry operations?
As early as the 1920s, some western scholars have discussed it. It has been suggested that northern nomads were using stirrups as early as the 1st or 2nd century AD, so the answer to this question is obvious. Others think that this answer is too arbitrary, from the information that has been found, not a single metal stirrup has been found; The horseman who lived a nomadic life was not so urgent, and the non-horseman, in order to master riding, naturally more urgent to resort to a complete harness. The earliest single stirrup found in the era appeared on the sculpture of Jiangnan, that is, the equestrial terracotta from the tomb of Yongning in the second year of the Western Jin Dynasty in Changsha.
Which of these two theories is closer to the historical truth? Due to the limitation of data, it is not possible to draw a more definite answer, and we should continue to explore rather than jump to conclusions. Even so, we can say with certainty that the earliest known metal stirrup specimens were found in the Central Plains, and the unearthed objects of the Jin tomb in Xiaomin Tun, Anyang fully demonstrate this problem.