Born in 1276, son of Emperor Go-Fukakusa of the Jimyoin imperial line. He arrived in Kamakura at age 13 in 1289 as the 8th shogun, succeeding Prince Koreyasu. Throughout his tenure, the ninth regent Hojo Sadatoki (1284–1301) and subsequent Hojo regents held all real power; Hisaaki had no say in governance. This period saw tokuso autocracy—Hojo main-line dominance—at its peak, and the shogun's only meaningful role was maintaining ceremonial ties with the imperial court. Major shogunate events during his tenure—the Heizen'mon Rebellion of 1293, the Einin Debt Cancellation Decree of 1297—all took place entirely without his involvement. After 19 years, he was deposed in 1308 and sent back to Kyoto, succeeded by his own son Prince Morikuni. He lived on until 1328, dying at 53. A prince placed as a nominal shogun at the very height of tokuso autocracy, he embodies the political structure of the late Kamakura shogunate.