Jōkyū War
Before enacting the Goseibai Shikimoku, the Kamakura shogunate conducted trials without formal laws. After the Jōkyū War, an increasing number of land disputes between its vassals, aristocrats and peasants made fair trials indispensable. Thereafter Hōjō Yasutoki compiled the outline with 51 article headings and 13 Hyojoshu (councilors) completed it.