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In page Castration:
"The Caliphate in Baghdad at the beginning of the 10th Century had 7,000 black eunuchs and 4,000 white eunuchs in his palace." The Arab slave trade typically dealt in the sale of castrated male slaves. Black boys at the age of eight to twelve had their scrotum and penis completely amputated. Around 9 out of 10 bled to death during the procedure, but the high price brought by eunuchs on the market made the practice profitable.