Populares and Optimates:
I have to wonder if they were created specifically as tools to keep whoever is playing the part of the puppet ruler in check. Even if they weren't, they're almost certainly going to exploited by the Ascians in regards to their plan to sow the seeds of chaos. We've already seen a direct example of Ascian manipulation using the two factions through the use of Asahi. If Titus had won the War of Succession, he'd be faced with Elidibus and Solus. He would also be dealing with the Optimates. With Varis, he's stuck dealing with Elidibus and Solus...with the Populares being exploited by Elidibus as a threat. By attacking the Populares, Elidibus is set to force Varis' hand. It also means that there will be further strife within Garlemald as rumours spread about the Emperor's harsh methods...despite him not necessarily being the one behind such acts.