The sources of western political thought include: civilization, civilization and civilization.

Hebrew/ Jewish, Greek and Roman

Western Civilization as it is known today have been influenced by the Judeo-Christian view which includes the even older Judaic tradition.  Ancient Greek civilization and culture as well as the influence of Ancient Rome also affected Western culture and politics.

Greek, Roman and Juedeo-Christian.

Explanation:

All Western political ideas are derived or adopted from Ancient Greece and Rome as they both passed through various stages of governmentality. The work of Aristotle, the Politics, is of great importance as it defined all known forms of government known to his time, and which, to this day, are still relevant. Later, as Christianity —which has an obvious antecedent in the Jewish tradition— spread all throughout the Roman Empire, it influenced political thought by introducing foreign notions in it like guilt, confession, sin, and, more importantly, transcendental notions of right and wrong.  

they made rome the dominant power in the mediterranean.