The article offers a new interpretation of history of the Slovak Memorandum from 1861 with the focus on the role of Jozef Justh. He has been mentioned quite often in connection with this document, but he is not a well-known character. Based on the traditional judgment made by his Slovak contemporaries in their memoires, he is considered as a "traitor of the Memorandum" and historiography later adopted this view. This image needs an in-depth correction.