Built in 1607, the Ooku, or “great interior,” housed the women of the Tokugawa clan, from the shogun’s mother to his wife and concubines. Strict rules prevented residents from fraternizing with outsiders, or leaving the grounds of Edo Castle without permission. Within the Ooku, an elaborate hierarchy governed day-to-day life; at the very top were the joro otoshiyori, or senior elders, who supervised the shogun’s attendants and served as court liaisons; beneath them were a web of concubines, priests, pages, cooks, and char women who hailed from politically connected families. This elaborate social system was mirrored in the physical structure of the Ooku, which was divided into three distinct areas — the Rear Quarters, the Middle Interior, and the Front Quarters — each intended solely ladies of a particular rank. The only male permitted into the Ooku (unescorted, that is), was the shogun himself, who accessed the “great interior” by means of the Osuzu Roka, a long corridor that connected the shogun’s living quarters with the imperial harem.
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