Białas A. Controversy over the Power Between the Papacy and the Empire in the light of Marsilius’ of Padua Defensor pacis. peitho [Internet]. 2010 Dec. 20 [cited 2024 May 19];1(1):145-59. Available from: https://pressto.amu.edu.pl/index.php/peitho/article/view/12244