 After World War II, for over four decades, world-class Polish philosophers and historians of philosophy such as Władysław Tatarkiewicz continued their work, often in the face of adversities occasioned by the dominance of a politically enforced official philosophy.The phenomenologist Roman Ingarden did influential work in esthetics and in a Husserl-style metaphysics; his student Karol Wojtyła acquired a unique influence on the world stage as Pope John Paul II.The formal history of philosophy in Poland may be said to have begun in the fifteenth century, following the revival of the University of Kraków by King Władysław II Jagiełło in 1400.