ENThe Vilnius Cathedral by Władysław Zahorski (1858-1927), published in 1904, was the first monograph of this church illustrated almost exclusively with photographs. In this article, the illustrative material contained in the aforementioned book is analyzed: the problem of the authorship of the photos (in the vast majority taken by the famous Vilnius photographer Stanisław Filibert Fleury), and the time and circumstances of their creation is discussed. Moreover, the role of photography in Zahorski’s academic activities and in research on the history of the cathedral at the beginning of the 20th century is characterized.