Lìshǐ shàng zuì yǒumíng de tàijiàn zhīyī shì Míngcháo de Zhèng Hé.
One of the most famous eunuchs in history was Zheng He of the Ming dynasty.
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The eunuch system (宦官制度) was a hallmark of Chinese imperial courts for over two millennia. Eunuchs underwent castration and served in the inner palace where uncastrated men were forbidden. At their peak of influence, powerful eunuchs could effectively control emperors and state affairs.