Written heritage of the Buryats in the Old Mongolian script

The article explores the written heritage of the Buryats in the Old Mongolian script, which for a long time was a common Mongolian literary language, starting from the 12th century. The Buryats have been used it as a written literary language since the 17th century until 1936. There were created unique compositions of different genres in the Mongolian script. In addition, the paperwork was carried out and newspapers and magazines were published in this script. The genre of historical chronicles is the most developed. The tradition of chronicle writing among the Buryats was continued in the 20th century. A previously unexplored anonymous written monument of the 1920s the “At sagat essay on the Khori-Buryats” is described. This essay, based on the combination of the traditions of Mongolian chronicles and Russian historical science, with elements of Buryat folklore, ethnography, eyewitness memories, the author's own observations, is a synthesis of genres of historical, literary, memoir nature. The change in writing in subsequent years led to the complete oblivion of both the authors and the monuments themselves. Meanwhile, these written sources, being a reflection of the linguistic picture of the Mongolian world, are of great interest to historians, philologists, and culturologists