NONE.filter - nkjv vassal:

nkjv@2Kings:17:3 @ Shalmaneser king of Assyria came up against him; and Hoshea became his vassal, and paid him tribute money.

nkjv@2Kings:24:1 @ In his days Nebuchadnezzar king of Babylon came up, and Jehoiakim became his vassal for three years. Then he turned and rebelled against him.