In The Tale of the Prophet Isaiah. The Destiny and Meanings of an Apocryphal Text Ivan Biliarsky proposes an edition of the original text of the medieval apocryphon, together with images of the single manuscript copy. The author also includes a large commentary on the otherwise quite unclear narrative concerning its origins, its development, a prosopography of the mentioned persons, an interpretation of its meaning and of the stages of its continuous creation. This completely new approach profoundly revises the source with a strong focus on its biblical roots. Ivan Biliarsky abandons the “national” understanding of the apocryphon and introduces evidence about its significance for the enforcement of the Byzantine-Slavic/Bulgarian Commonwealth and solidarity.