But now, nearly three hundred years after the founding of the Empire, the Lords of the Empire, including the Princes, had lost the real power to form their own armies.
This was because, as the Empire unified Imperial Star, advancements in technology including communications, transportation, and weaponry had made it more convenient for the Emperor's power to manage the entire planet.
What had been a stocky trunk with weak branches had become a mighty trunk with feeble twigs.
The Royal Army was able to continuously develop and became the strongest standing force of the Empire. The Lords had no opportunities to wage war against each other. Maintaining private armies not only increased attrition but also led to the Emperor's dissatisfaction, facing all sorts of petty oppressions.
Consequently, the nobles, who nominally had the power to form armies, could only disband their large private forces and formed quality-oriented Personal Guards instead.