In the era from the latter half of the eleventh century to the twelfth century, the number of shoen increased rapidly, and Kokugaryo (territories governed by a provincial government office) were reorganized correspondingly, establishing the medieval tax collection system called Shoen Koryo sei (the system of public lands and private estates).
11世紀後半から12世紀にかけて、荘園が急速に増加するとともに、それに対応して国衙領が再編成され、荘園公領制という中世的収取体制が成立した。