'Master' in the Bible

And the king spake unto Ashpenaz the master of his eunuchs, that he should bring certain of the children of Israel, and of the king's seed, and of the princes;

O Belteshazzar, master of the magicians, because I know that the spirit of the holy gods is in thee, and no secret troubleth thee, tell me the visions of my dream that I have seen, and the interpretation thereof.

There is a man in thy kingdom, in whom is the spirit of the holy gods; and in the days of thy father light and understanding and wisdom, like the wisdom of the gods, was found in him; whom the king Nebuchadnezzar thy father, the king, I say, thy father, made master of the magicians, astrologers, Chaldeans, and soothsayers;