 Barely 30 years into the shogunate, the Seiwa Genji dynasty who had created it in Kamakura had ended.In 1293, a severe earthquake killed 23,000 people and seriously damaged the city.In the confusion following the quake, Hōjō Sadatoki, the Shikken of the Kamakura shogunate, carried out a purge against his subordinate Taira no Yoritsuna.