The Hōjō Clan was a powerful samurai family in Japan during the late Heian and Kamakura periods. They initially served as regents for the Minamoto Clan and later became the de facto rulers of Japan. The clan is known for its significant influence in politics and military affairs, particularly during the 13th century. The Hōjō Clan established the Kamakura shogunate, which marked the beginning of feudalism in Japan. They were instrumental in defending Japan against the Mongol invasions in 1274 and 1281. However, their power declined in the late 14th century, leading to their eventual downfall.