This volume presents a set of papers on the unusual case of the 17th-century martyred Archbishop Josaphat Kuntsevych. Between 1540 and 1770, the Catholic Church canonised only twenty-seven men and women, and declared a further six to be Beati. Among these six was Josaphat Kuntsevych, whose beatification in 1643 was a significant achievement for the Ruthenian Uniate Church. The studies in this book examine the mechanisms, strategies, actors, and practices involved in the cult of Saint Josaphat during the Early Modern period, as well as, in modern times, the construction of his transnational image. The volume gathers together research first presented at the 2023 conferences in Vilnius and Rome which marked the four-hundredth anniversary of the saint’s martyrdom.