'Mistress' in the Bible

and she saith unto her mistress, 'O that my lord were before the prophet who is in Samaria; then he doth recover him from his leprosy.'

and Jehu hath found the brethren of Ahaziah king of Judah, and saith, 'Who are ye?' and they say, 'Brethren of Ahaziah we are, and we go down to salute the sons of the king, and the sons of the mistress.'