Abstract: The following article examines a very provocative phenomenon, which problematizes the manifestations of the Slavic idea in the context of modern aesthetic concepts emerging at the end of the XIX century. Among the idea’s most passionate defenders is the creator of the art nouveau style Alfons Mucha. The Czech artist’s conviction that the modern language of painting is capable of depicting not only new but also traditional, and therefore anachronistic themes, such as the theme of Slavic unity, is rejected by the critics of Czech art. However, the positive reception of his art, both abroad and in Bulgaria, stands out against the background of the deepening conflict, especially with the appearance of his monumental cycle Slavic Epic (1914-1926).
Key words: Alfons Mucha, art nouveau, Slavic Epic, Bulgarian reception of Mucha