'Eunuchs' in the Bible

The king spoke to Ashpenaz the master of his eunuchs, that he should bring in [certain] of the children of Israel, even of the seed royal and of the nobles;

The prince of the eunuchs gave names to them: to Daniel he gave [the name of] Belteshazzar; and to Hananiah, [of] Shadrach; and to Mishael, [of] Meshach; and to Azariah, [of] Abednego.

But Daniel purposed in his heart that he would not defile himself with the king's dainties, nor with the wine which he drank: therefore he requested of the prince of the eunuchs that he might not defile himself.

Now God made Daniel to find kindness and compassion in the sight of the prince of the eunuchs.

The prince of the eunuchs said to Daniel, I fear my lord the king, who has appointed your food and your drink: for why should he see your faces worse looking than the youths who are of your own age? so would you endanger my head with the king.

Then Daniel said to the steward whom the prince of the eunuchs had appointed over Daniel, Hananiah, Mishael, and Azariah:

At the end of the days which the king had appointed for bringing them in, the prince of the eunuchs brought them in before Nebuchadnezzar.