Princess Cadence and prince Shining Armor.

When they came to power the Crystal Empire ponies celebrated over the fact their former tyrant ruler had been cast out. But they never could have understood the economic ramifications of putting an equestrian pony in charge of the Empire. Cheap exports, costly imports, and a heavy equestrian military presence have pushed the Crystal Empire ponies into tough economic times. Now a new idea of sweeping across the empire.

Revolution

Jecht: Do you hear it Princess? Do you hear the ponies sing?

some ideas taken from les Miserables, thus the crossover tag