I want a class system in an enclosed citadel with Roman times technology.
It is based around the idea that the farmer class work the land to bring food to the entire country.
All farm lands are property of the Queen.
The citadel pays off the farmers with free services like Academy training, scholarship, free medications, teachers and more importantly shelter for the entire family.
The city is impenetrable with beehive-like hexagonal perimeters where each side of the hexagon is a thick wall with guard towers.
Even the farm lands are restricted into different hexagons.
The city is also built centered on a really high hill making the hexagons in the center of the city the hardest to attack.
The city is still vulnerable to sieges but has enough resources to destroy any invader.
Also the citizens are not humans but centaurs with an incredible power when compared to humans.
And when the population overgrows the city expands by building new hexagons where each exagon can hold enough space for 450 families, with this system every new hexagon requires less walls to be built depending on the direction, a new hexagon centered to the north side of two older hexagon only requires 4 walls to be built instead of 6.
My question is: as for now the citadel is focused on a strict class system based on devotion, to make it work do I have to isolate completely the citadel and not allowing any external trading?