后杭爱省
Turkic Kaganate - the so-called "Bugut Stele" of the late 6th century from Arkhangai Province in western Mongolia with a Sogdian and (most likely) Brahmi Mongolic inscription was installed on a stone tortoise. It is now in the provincial capital, Tsetserleg. According to the Turkish researcher Cengiz Alyilmaz, it was the design of this stele that influenced the builders of the important 8th-century stelae with Old Turkic inscriptions, many of which also stood on tortoises. Among them, the most accessible one is probably Bayanchur Khan's (Eletmish Bilge Kağan)'s Terhin-Gol stele (753 AD), now in the Mongolian Academy of Sciences in Ulan Bator.