The aim of the article is to present the insurgent activity of Marian Dubiecki, secretary of Ruthenia in the Polish National Government of January Uprising. During his tenure, he was one of Romuald Traugutt’s closest collaborators, occupying the outbuilding next to his apartment, and a person who introduced the later dictator at the meeting of The Polish National Government. Dubiecki’s duties included correspondence with other representatives of the insurgent administration and negotiations with the “Progressive Ruthenia Group”. After minister of state Józef Kajetan Janowski left Warsaw, the secretary of Ruthenia undertook action to combine both functions. As a result of his insurgent activity, Marian Dubiecki was arrested and sentenced to exile, from which he returned in 1883. The figure of the secretary of Ruthenia has not yet been the subject of an extensive historiographical research that would comprehensively analyze his biography.