吾妻鏡
Although not part of Kamakura proper since it lies outside the city's Seven Entrances, the entire area from Katase to Inamuragasaki represents a historically important area just outside the former military capital. According to the "Azuma Kagami" and the "Shinpen Kamakurashi", Shichirigahama was the Kamakura shogunate's execution ground. It was also the scene of many battles, and records show that in the Edo period bones and rusty weapons were still being recovered from its sand.