This post comes late; sorry for that.
Anyway,
The Bard wrote:
One reason you see a lot of bad kings and emperors is history.
Look at the kings of England, France, Germany.
I have a favorable view of many of them. Of course, the thread isn't about why monarchs in fantasy are generally evil (they're not, in my experience), but why emperors get a worse rap than kings, while other ranks are left out altogether. For instance, why is there never a sovereign Duke? Historically, there were many sovereign Dukes. Some of the monarchs of Europe historically( and here I'm only counting independent monarchs or direct subjects of the Holy Roman Emperor):
The Dukes of Brabant
The Dukes of Burgundy
The Landgraves of Hesse
The Grand Princes of Muscowy
The Archdukes of Austria
The Princes of Monaco(still reigning)
The Grand Dukes of Luxembourg(still reigning)
The Counts of Tripoli(not in Europe, but a Crusader polity ruled by European monarchs)
and the list goes on. Kings and Emperors are not the limit of monarchies.
The Bard wrote:
And the kings of Israel in the bible after Solomon and David.
Yeah, Israel went pretty badly. Judah wasn't so bad. But those were kings, and kings usually get off pretty easy in fantasy. It's emperors we do all the hating on.
@Reiyen, cephron:
You make good points, but not all Empires work that way. For one thing, some empires (I think in particular of the Habsburg domain) were built primarily through marriage and inheritance, rather than conquest. Also, the idea that "one nation or people is exerting its will over another," which is generally considered bad, is considered very important in modern times. Historically, however, especially before the French Revolution, nationalism was simply not the force it is today. Moreover, in non-democratic governments, it is far less the case that "one people" is imposing its will even on itself, much less another race. Still, I can understand why, especially in a modern context, these facts do cause empires to be viewed negatively.