After the fall of Rome, the most prevalent political system across Europe was absolute or senatorial Monarchy. While some of these systems were far more open to the people, such as Orleans, were anyone could attend City Councils, while others completely rejected people out side the system. this was most widely seen in Etrusca, were the government was made up of people from the upper classes. While these officials still technically had to be elected, these elections where always little more than play acting, and most of the time the winner was decided ahead of time. While these nations marked the two extremes, most other nations in the time period fell somewhere between them. with some form of Monarchy.
The one exception to this rule was the Senone Republic. This nation was a full democracy, with lifetime terms for its leaders. While this is far from modern democracy, it was revolutionary for the time, and would serve as model for future democracies. Outside the Senone Republic, very little advances would be made in terms of political ideology. Most nations would keep approximately the same system though the Entire era - and why wouldn't they? Their current systems worked fine. Overall, Monarchy would be the prevalent Political system throughout this era, and for a long time after it.