Revolution
Eisen goes through a period of severe upheaval as workers demand more rights, unification of the various Eisen city-states, and various races demand equality. King Ferdinand the second steps down and retires to the country after a relatively bloodless revolution. The sparks of revolution result in a unified Eisen under one parliament with each noble house allowed to participate. Each noble family within the house governs a Duchy, which represents their people in parliament. (was 1820-1830 in real world Germany)