The Overlord wrote:
Why did the Klingons get rid of the position of Emperor for 300 years? It doesn't seem like the position was abolished through a popular uprising, the Chancellor and the High Council still seem autocratic.
Uprisings aren't always populist. Sometimes the nobility gets tired of the monarchy telling them what to do and kicks it out so they can run things themselves. It's not about serving the public, just about serving the self-interest of the noble classes.
I figure it was probably something like the English Civil War, where the Parliamentarians kicked out the Royalists for a while and Oliver Cromwell ruled England. In this case, the warrior-class nobility among the Klingons overthrew the emperor and formed the High Council so they, the nobles, could run the show. And the common people probably noticed little difference in their lives, as is usually the case with revolutions throughout history.