'Master' in the Bible

And the king spake unto 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;

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, were found in him; and the king Nebuchadnezzar thy father, the king, I say , thy father, made him master of the magicians, enchanters, Chaldeans, and soothsayers;