Final answer:
Historical records indicate that eunuchs commonly served in the harem, overseeing and protecting the private quarters of rulers, which involved considerable influence and responsibilities.
Step-by-step explanation:
The eunuch had once served in the harem. This is evident from historical accounts which detail that eunuchs were typically chosen to serve in such roles due to their perceived loyalty to the emperor or sultan. Eunuchs often wielded considerable influence within the palace, including managing the household of the ruler and guarding the private quarters, such as the harem. Specifically, in the Ottoman Empire, enslaved eunuchs guarded the sultan's harem, which housed his concubines, children, and female relatives. This role entrusted them with significant power despite their status.