Do you know about Achaemenid kings? The Achaemenid Empire was the first and only government that unified the whole world for more than two centuries. This empire was also the world's first superpower. The important feature of this government was respect for individual and ethnic freedom, respect for law and order, encouragement of native art and culture, as well as promotion of commerce and knowledge.
So you should choose your own king.
And the princesses will come.