Analysing the political attitudes of professors at Paris University in the 1st third of 15th century, the author focuses on Jean Gerson who courageously opposed the ideological constructions of his contemporaries that were unscrupulously serving power struggles. In the next part she draws attention to the Altar of five Johns, where Gerson is depicted in the company of four renowned saints and proceeds by reflection on relation of the altar painting’s donor Johan Henckel to the personality of Jean Gerson and its significance for our historical narrative