Abstract: The subject of the research is the study of genealogical legends about Tyuluyen-oyuun as a historical and ethnographic source about the Bordons Yakuts. The purpose of the research is a comprehensive study of genealogical traditions as a historical and ethnographic source by analyzing and verifying historical and ethnographic information with archival documents. To achieve the goal, the following tasks are set: 1) to trace the historiographical experience of accumulation and study of Yakut historical traditions; 2) to reveal the reliability of historical and ethnographic information of traditions by checking with archival documents; 3) consider the specifics of compiling, storing, and transmitting written versions of pedigrees. The folklore material collected by N.T. Stepanov occupies a central place in the research. The source base of the study is represented by published (collections of archival documents on the early history of Yakutia) and unpublished documents (revision tales, 1917 census materials, separate statements, etc.). The chronological scope of the study is limited to the period from 1632 to 1768. The research methods are based on general scientific (dialectics, comparison, system-structural) and historical methods (historicism, historical-genetic, source analysis). The novelty of the research lies in the fact that, based on the involvement of a wide range of sources and folklore materials, an attempt has been made to historically and ethnographically study Yakut genealogies using the example of the Bordons. Based on the results of the work, it was concluded that further research is necessary due to the presence of a large number of unpublished documents. The research materials can be used in the process of teaching historical subjects, developing textbooks, conducting individual and generalizing research on the history of Yakutia.

Keywords: review of documents, administrative and territorial structure, nasleg, yakuts, bordons, malzhegars, Nyurbinsky ulus, Yakutia, ancestral composition, genealogy