Actually, Brunas City's Sheriff did not dare to capture 500 prisoners; he even had to turn a blind eye to the slightly influential gangs within Brunas City.
The Kingdom's rule was built upon the support of the Nobility and conglomerates, and to maintain the privileges of the Nobility and conglomerates, the entire Kingdom had always maintained a rather lax management system for private militaries.
The Nobility had knights under them, knights who were originally mounted combatants from the noble Soldier class and had now developed into a title.
These noble lords had their own Guardian Knights, appointed by the Nobility themselves with only a restriction on the number, not requiring any registration.
According to the Kingdom's law, a Baron should have three knights under him, a Viscount should have ten, an Earl could have thirty knights, and a Duke would have one hundred knights as his private military.