Theme System — Government Reform
Theme System is a government reform available to any government type in Europa Universalis IV.
Theme System
Any governmentKing of Kings DLC
Theme System is a government reform that can be adopted by any government type. Reforms are chosen one per tier to shape how your nation is governed.
In-game description
Themes were Byzantine systems of provincial divisions based around the military. Greatly tying the civil administration to the military, they helped provide frontier areas with proper defense and improved military capabilities of the state.