Are you talking about Democracy??? Where every citizen of the state has a vote in a council? or are you talking about Representative Democracy were upon each citizen elects a representative to vote on said council?
Ironically a lot of countries have provisions against mob rule why is that?
The romans had a similar system we have nowdays, although they didnt call it democracy, rather Res Publica (the public thing). However they had a very complex system which had a lot of councils and houses to rule, all designed to run a city-state, however as time went by a lot of these became purely ceremonial, and only two houses really remained, the plebian assembly and the Senate. The Senate is where the nobles sat perse, and as time went by the Senate accumulated most of the power. However it was still second fiddle to the real rulers of the city, as it roles was mostly advisory >_>;
The banners they carried had S.P.Q.R. - Senatus Populus Que Romanus (Senate of the People of Rome bad latin translation).
However Westminster (British parlimentary system) is not quite a direct copy of that (its more evolutionary taken many years to form), where as the US is a cross from Westminster and Rome.
Australia's cross from the US and Brittish, why government is formed in the lower house, where as the US its a seperate entity from the houses (perse government of the day)