A teacher in the service of the poor
Born around 1390 in Kęty, in Poland near Kraków, John showed exceptional intelligence from a young age: at just twenty-seven years of age he was already teaching philosophy. In 1416 he was ordained a priest and almost immediately entrusted with the direction of the school attached to the Monastery of the Holy Sepulchre in Miechów. He remained there for about eight years, until 1429, when he returned to the University of Kraków.