Samuel Huntington had a few things to say about this in his “Clash of civlizations”. And, of course, there was Plato with his “Republic” and his dialogues. And there were a few fellows in between. They all had some vague ideas about both, the concept of democracy and the idea of Western Civilization.
And to the folks who claim that there is no such thing as “Western civilization”, I suggest that using their logic, one could conclude that there is no such thing as “is”, not to mention the concept of “there”.
And to the folks who claim that there is no such thing as “Western civilization”, I suggest that using their logic, one could conclude that there is no such thing as “is”, not to mention the concept of “there”.