His last, and perhaps the most momentous act, was his will and testament known as "The Succession Statute" in which he divided the country among his sons, leading to almost 200 years of feudal fragmentation of the Polish Kingdom.
Njegov posljednji, a po posljedicama vjerojatno i najvažniji čin bio je testament zvan "Zakon o nasljeđivanju" kojim je zemlju podijelio među sinovima, a što je dovelo do skoro 200 godina feudalne fragmentacije poljske države.