Henryk IV Probus
It is believed that Leszek II initiated a process for the unification of Poland. According to the theory of historian Oswald Balzer, Leszek II called the First Piast Coalition, formed by four princes: Henryk IV Probus, Przemysł II, Henry III of Głogów, and himself, on or about 1287, whose main purpose was to arrange the order of succession in Lesser Poland. This hypothesis is refuted by modern historiography because of the known bad relations between Leszek II, Przemysł II, and Henryk IV Probus during this period. On the other hand, the apparent national unification could have been a result of the growing cult to Saint Stanislaus of Szczepanów.