'Master's' in the Bible

Then the king summoned Ziba, Saul’s servant, and said to him, “I have given your master’s grandson everything that belonged to Saul and to all his house (family).

You and your sons and your servants shall cultivate the land for him, and you shall bring in the produce, so that your master’s grandson may have food to eat; but Mephibosheth, your master’s grandson, shall always eat at my table.” Now Ziba had fifteen sons and twenty servants.

I also gave you your master’s house, and put your master’s wives into your care and under your protection, and I gave you the house (royal dynasty) of Israel and of Judah; and if that had been too little, I would have given you much more!

Then the king said, “And where is your master’s son [Mephibosheth]?” Ziba said to the king, “Behold, he remains in Jerusalem, for he said, ‘Today the house of Israel will give me back the kingdom of my father.’”