[Admins]

Another more advanced idea is to have some kind of sub-kingdom or 'village'. People can found villages and put weapons and money into the treasury of the village. That treasury is co-owned by all people in the village. New people can only join a village if all members agree to it. The treasury is protected by a magical crystal which can be powered up with money or by owning conquerable islands - there would be a magical crystal on those islands and the power would periodically be transformed to the villages of the kingdom that owns the island. Strong villages would have more influence in the kingdom. Since the power that is taken from the crystals on the conquered islands is put equally into the villages of the kingdom it can be a bad thing if there are too many people, so auto-balancing the count of members of a kingdom. If the crystal of a village has no power anymore then you will need to feed it with money, or other people can open the treasury and loot your houses.
This idea would allow more individualism, since people can make their own one-man village, but would also encourage forming groups of people supporting each other.