This research monograph examines presidential constitutional conventions and the role they play in the political systems of four Central European countries – the Czech Republic, Slovakia, Hungary, and Poland. As primarily unwritten rules of constitutional practice, constitutional conventions represent political arrangements and as such are political in origin. Not only this, constitutional conventions, in general, and presidential constitutional conventions, in particular, have significant political implications. They shape both the everyday operation and character of regimes. Central Europe represents a particularly useful example on which this role of constitutional conventions can be studied and assessed.