Semiramis was an Assyrian queen who, after the death of her husband, went on to revive Babylon and conquer Asia Minor and Northern Africa.
She is also credited with inventing the chastity belt. Roman historian Ammianus Marcellinus credits her as the first person to castrate a male youth into eunuch-hood: “Semiramis, that ancient queen who was the first person to castrate male youths of tender age”
Source: Wikipedia