'Master' 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;

Belteshazzar, master of the magicians, because I know that the spirit of the holy gods is in you, and no secret troubles you, tell me the visions of my dream that I have seen, and its interpretation.

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