Gokturk <a href="https://en.wikipedia.org/wiki/petroglyph" class="extiw" title="en:petroglyph">petroglyphs</a> from Mongolia
The Göktürks
6th to 8th century AD
<a rel="nofollow" class="external free" href="http://depts.washington.edu/silkroad/museums/ubhist/ubhist15a.jpg">http://depts.washington.edu/silkroad/museums/ubhist/ubhist15a.jpg</a>