EN
The author of the article carried out a source study and historiographical analysis of the factual material contained in "Istoriia rusiv" that elucidates the history of South Slavic peoples and Ukrainian-South Slavic relations. The political task, confronting the author of "Istoriia rusiv", led to appearance in the Southslav plots conscious fiction which had not only historiosophical, but sometimes artistic meaning. Therefore, some of them have a completed plot form and include romantic figurative-expressive means. Moreover, the unknown writer provides information on the southern Slavs exclusively in the light of the national history.