The nanboku-chō period, occurring from 1336 to 1392, was a significant era in Japanese history marked by the struggle between two rival imperial courts: the Northern Court (nan-chō) and the Southern Court (nanboku-chō). This period arose from a power struggle following the Kamakura shogunate's fall, leading to conflicts that shaped the political landscape and set the stage for the rise of the Ashikaga shogunate.