A client state is a state that is economically, politically, or militarily subordinate to another more powerful state in international affairs.

Types of client states include: satellite state, associated state, puppet state, neo-colony, protectorate, vassal state, and tributary state.

A client state was a politic strategy mostly used by the ancient Greece/Rome:

Ancient states such as Persia and Greek/Rome city-states would create client states by making the leaders of that state subservient.

Classical Athens, for example, forced weaker states into the Delian League and in some cases imposed democratic government on them.

A democratic government was one that gave it’s subjects the democratic freedom of behaving immorally, contrary to what their religious moral values required.

Herod was a client king set over the province of Judea – in Israel:

The example we can use is the client king Herod that was sett up to govern Judea in Israel by the Roman empire.

Such a king was there to influence and implement the laws of immorality which goes against the moral values of Torah that Israel had to follow or live by.

Republican Rome which, instead of conquering and then absorbing into an empire, chose to make client states out of those it defeated (e.g. Demetrius of Pharos), a policy which was continued up until the 1st century BCE when it became the Roman Empire.

Part of Article text was taken from Wikipedia.org