Democracy in Greece was ended by the greeks themselves. Monarchy was the rule from Alexandrian times through to the fall of the Byzantine empire.

I buy the argument that modern representative democracy is descended from Germanic practices. Germanic warriors 'electing' their leader -> landed men having representation through a house of lords or parliament -> modern suffrage movemetns. See the origins of the Icelandic or British parliaments. But nearly any society based on a widespread warrior class was in some way democratic, from Rome to the Mongols.