When I visited a bookstore in central Tokyo on Jan. 9, I came across a corner featuring the Hojo clan, which wielded enormous power in the Kamakura Shogunate (1185-1333). I was surprised by the ...

expanding the Hojo clan territory over the Kanto region for the next hundred years. After the downfall of the Hojo clan, the Okubo clan took over the lordship of the castle until the end of the ...