The work Slovak Coup, which maps the events associated with the end of the First World War in Slovak realities, is one of the key works of Karol Anton Medvecky, who was an important political, ecclesiastical and cultural figure in Slovak society in the first third of the twentieth century. As secretary of the Slovak National Council and a signatory of the Martin Declaration, he was an important participant in the groundbreaking events of 1918. In this paper, we discuss some selected aspects of the origin and significance of Mevecky’s work, such as the social background, the author’s aim, the reaction in the political battles of the interwar period and an assessment of its relevance for today’s historiography, which in our opinion provide the basic characteristics necessary to understand the Slovak Coup and its author from social as well as historiographical point of view. The work does not attempt to exhaust the examined issue, but does want to be the basis and stimulus for its deeper research.