What PC class should a well-designed ruler have?

[MaxiDuRaritry]

Depending on how active he is in military campaigns, how about society mind?

Not all kings sit on a throne and direct operations from behind the back lines (or just allow his heads of military to do it while he [occasionally] pretends to be useful); some are warriors and conquerors, and being able to directly link all of his generals' minds together while buffing and healing them could give a significant edge in major offensive and defensive operations.