Capitoleum Militia
Oficially named the Capitoleum Milita, the force is better known as the Stripes because of their well-known striped shoulderpads. They are generally well trained and of a decently low corruption level. Though that depends on where you are in the capitol. They are also in charge of patrolling the Coins: the main trade highway roads. Most of the patrols are people from Capitoleum themselves, but each House which has a stretch of the Coins under its control has a duty to supply men for the local bits in order for the Stripes to be effective. Since the Stripes is limited in power, no current owner of trade highway is against this notion. In order to facilitate neutral guardianship, soldiers from different houses are frequently placed in other kingdoms than their own.
In the view of the commoners, the Stripes can be seen as a helping hand or an oppressive facist force, depending on where you live. Almost everyone likes the Stripes that patrol the Coins, but many districts of Capitoleum has more corrupt guardmen, unfortunately.
There are rumours of a seat of power starting to develop in the command of the Stripes, but because of how the system is built, that is very unlikely.