Are you so daft? You do realize your on a website called “Free REPUBLIC” don’t you?
WHere do you think the concept of a REPUBLIC came from?
Not Islam, but ANcient Rome!
Although you are chasing the history of the Republic:
"WHere do you think the concept of a REPUBLIC came from?",
you might also address readings that can clarify:
"WHere do you think the concept of a REPUBLIC went to?"