Igorlied
A French Slavist André Mazon and later a Soviet/Russian historian A. A. Zimin proposed that, "The Tale of Igor's Campaign" was written based on poetic images and ideas from "Zadonshchina". They proposed that "The Tale of Igor's Campaign" was not an Old Russian text, but an 18th-century forgery. Indeed, the view of the "Igor' Tale" as a late forgery certainly implies that it is imitation of Zadonshchina, as the two texts are undoubtedly related. This approach is criticized by linguists, notably Roman Jakobson and Andrey Zaliznyak who show that the language of the "Igor's Tale" is far more archaic, and that the passages in "Zadonshchina" allegedly borrowed from the Tale differ from the rest of the work by linguistic criteria (whereas in the Tale no such distinction can be drawn).