Radosław Kotecki is an Adjunct Professor at the Institute of History and International Relations of the Kazimierz Wielki University in Bydgoszcz, Poland, which he joined in 2014. His interests are focused on comparative medieval history, particularly the relationship between rulers and the Church, religion, canon law, violence against the Church, clerical involvement in warfare, rituals of penance and the problem of communication in high medieval societies of Western and East-Central Europe. He is currently the main organizer of the international project “Clerics and War in Medieval Europe: New Perspectives”, and is preparing the manuscript of his first monograph on the idea of defensio ecclesiae in the medieval West before the middle of the 12th century.Jacek Maciejewski is Associate Professor and Head of the Institute of History and International Relations of Kazimierz Wielki University, Poland. His research concerns the career patterns of senior clergy and their participation in the social, cultural and political life of medieval Poland and other European countries (with special reference to episcopacy), as well as the history of church-state relations and episcopal rituals. He is the author of three books, including Polish Episcopacy of the Feudal Defragmentation Era, 1180-1320 and Adventus episcopi: Non-Liturgical Aspects of Episcopal Inauguration in Medieval Poland on the European Background, as well as numerous articles and book chapters. He is the co-organiser of the international project “Clerics and War in Medieval Europe: New Perspectives”.