The first constitution of Republic Tannu-Tuva ulus (Uriangkhai nation), was adopted 90 years ago, on 15 August 1921. This article about that event  is based on archival materials.

The Pan-Tuvan Founders' khural (Congress), which took place from 13 to 16 August 1921 in Sug-Bazhy near Russian village Atamanovka (now Kochetovo), two projects of the Foundation Law, similar in content and intent,  were evaluated. On 14 August 1921, a third project was reviewed, concerning the Constitution of Tannu-Tuva ulus.