A eunuch is a man who has been castrated, either by having the testicles removed or rendered nonfunctional. Throughout history, eunuchs served as palace officials, harem guardians, religious figures, and trusted advisors to rulers across Asia, the Middle East, Africa, and Europe. The practice spans thousands of years and dozens of civilizations, making eunuchs one of the most widespread yet often misunderstood figures in human history.
Why Castration Was Practiced
The reasons varied by culture and era, but a few motivations appeared repeatedly. Rulers wanted servants who could never father children or build rival dynasties. Castrated men were seen as uniquely loyal because their futures depended entirely on the ruler who employed them, not on family ambitions. In royal households with large harems, eunuchs could attend to women of the court without the risk of sexual relationships or illegitimate heirs.
Some men were castrated as children, sold by impoverished families or captured in war. Others underwent the procedure voluntarily to gain access to powerful court positions or, in the case of European singers, to preserve a prized vocal range. In some religious traditions, castration carried spiritual meaning, marking a person as set apart from ordinary social categories.
Physical Effects on the Body
Castration removes the body’s primary source of testosterone, and the effects depend heavily on whether it happens before or after puberty. When performed on a boy before puberty, the absence of testosterone changes the course of physical development in visible ways. The long bones of the arms and legs continue growing longer than they normally would because testosterone is what signals the growth plates to close. This produces a characteristic body shape: unusually long limbs relative to the torso. Facial bone growth is also altered, and the voice never deepens. The medical term for this pattern of development is eunuchoidism.
When castration occurs after puberty, the changes are less dramatic. A man’s voice stays deep, his skeletal proportions remain the same, and previously developed muscle mass decreases only gradually. In both cases, body hair thins over time, fat redistributes toward the hips and chest, and muscle strength diminishes compared to intact men.
One striking finding comes from a study of 81 Korean eunuchs who served during the Chosun dynasty. Researchers examined genealogical records and found that these eunuchs lived an average of 70 years, which was 14 to 19 years longer than non-castrated men of the same socioeconomic class. The difference suggests that testosterone, while essential for reproduction and physical development, may carry long-term costs for male longevity.
Eunuchs in the Byzantine Empire
Byzantium offers one of the clearest examples of eunuchs operating at the highest levels of government. Far from being mere servants, Byzantine eunuchs were an extraordinarily educated class who held positions as military commanders, senate presidents, and close imperial advisors. Their proximity to the emperor gave them constant access to the center of power, and their inability to found dynasties made them, in theory, safer confidants than ambitious nobles.
The eunuch Narses is perhaps the most famous example. In the sixth century, Emperor Justinian I sent Narses to advise his top general, Belisarius, during the conquest of Italy. When Justinian recalled Belisarius in 548, he made Narses the sole commander of all forces in Italy. Another notable figure, Basil of Lekapenos, served as a senior advisor under three successive emperors and was even appointed president of the senate. Eunuchs also rose within the Christian Church, where men who had been castrated involuntarily (by captors, physicians, or masters) were permitted to climb the ecclesiastical ranks.
This influence eventually faded. Under the later Palaiologan dynasty, Emperor Alexios I ended the tradition of the emperor’s closest advisor being a eunuch. The last known eunuch to command a Byzantine army did so in 1281.
Eunuchs in Imperial China
China’s eunuch tradition was among the longest and most elaborate in the world, reaching its peak during the Ming dynasty (1368 to 1644). The founding Hongwu Emperor initially kept eunuchs under tight control, placing a relatively small number under a single directorate. But as their numbers grew into the thousands, so did their institutional footprint. Eventually, twenty-four major agencies were created to organize them: twelve directorates, four offices, and eight bureaus covering everything from food supply and ceremonies to weapons, laundry, textile production, and orchards.
The real power shift came under the Yongle Emperor, who allowed eunuchs to hold positions of genuine authority. They oversaw state workshops, led armies, and interfered in the appointment of officials. Over time, eunuchs built a parallel administrative network that operated independently from the traditional bureaucracy. The most potent instrument of eunuch power was the secret service, based in the Eastern Depot and later the Western Depot, which reported directly to the Directorate of Ceremonial. The eunuch who ran that directorate effectively became chief of palace staff with near-dictatorial influence.
Several individual eunuchs wielded extraordinary power. Wang Zhen, Wang Zhi, and Liu Jin each held quasi-dictatorial authority at different points. By the 1590s, under the Wanli Emperor, eunuchs had been granted the right to collect provincial taxes and oversee civil administration across the empire. Their official rank was capped at 4a in the imperial hierarchy, but their actual influence often far exceeded that of higher-ranked civil officials.
Eunuchs in the Ottoman Empire
The Ottoman court divided its eunuchs into two main groups: black eunuchs and white eunuchs, each with distinct roles. The most powerful position in the imperial harem, after the Sultan’s mother (the Valide Sultan), belonged to the Chief Black Eunuch, known as the Kizlar Agha. This figure served as the central link between the secluded inner world of the harem and the outer world of palace politics, controlling access, managing communication, and wielding considerable behind-the-scenes influence. Many of these eunuchs had been enslaved as boys from East Africa before being brought to the Ottoman court.
The Castrati of European Opera
Starting in the late 1500s, boys in Italy were castrated before puberty to preserve their high-pitched singing voices into adulthood. The result was unlike any voice heard today. A castrato retained the small larynx of a child, producing a high pitch, but his body continued growing to adult size. This meant fully developed resonating chambers in the throat, mouth, and skull, paired with an adult-sized rib cage. Many castrati also developed a condition called pectus carinatum, where the rib cage expanded outward, creating even greater lung capacity.
Combined with years of intensive vocal training, this anatomy produced a voice of extraordinary power and range. The sound was not the same as a female soprano or a modern countertenor. It was something distinct: a child’s pitch driven by adult lungs and resonance. Castrati dominated Italian opera for roughly two centuries before the practice fell out of favor in the 1800s as attitudes toward the ethics of the procedure shifted.
The Hijra of South Asia
In India and neighboring countries, the Hijra community represents a living cultural tradition connected to, but distinct from, the historical concept of eunuchs. Hijras are devotees of the Mother Goddess Bahuchara Mata, and their sacred role in society is tied directly to their sexuality and gender identity. Traditionally, Hijras are invited to bless newborns and weddings, with their powers considered contingent on their renunciation of conventional male sexuality and identity.
The community includes people who have undergone castration as well as intersex individuals and transgender women. India’s Supreme Court recognized Hijras as a legal third gender in 2014, though the community continues to face significant social marginalization. Many Hijras live in organized households led by a guru, and the internal social structure has its own hierarchy, traditions, and codes of conduct that have persisted for centuries.
Eunuchoidism in Modern Medicine
Today, deliberate castration for court service or vocal training no longer exists. But the term “eunuchoidism” survives in medicine to describe a condition where a boy’s body does not produce enough sex hormones before or during puberty. The result mirrors what happened to historical eunuchs: disproportionately long limbs, underdeveloped secondary sex characteristics like facial hair and a deep voice, and reduced muscle mass. The causes are now understood as hormonal disorders rather than surgery, and the condition is treatable with hormone replacement therapy that can restore much of the expected physical development when started early enough.