As nobles are born into their position by the grace of the gods, no mortal man has any right to question their authority or action. However, I believe that if a man is granted a vision by the gods, they must do everything in their power to do, what they were told to do in their vision. This statement is, however, assuming that this vision does not conflict with the nobles, for they hold their power by the grace of the gods, and thus only the gods have any right to remove them from that position.
I have had a vision, telling me to write what you are now about to read, and I hope that I will appease the gods, by spreading the knowledge they wanted me to spread.
However, no two men were created equal, and neither were two nobles. Certain individuals have God-given rights to rule over ordinary men. However, some have God-given rights to rule over these individuals. The prime example of this would be our most honourable Archon; the great Pericles Megakyrios. As the Archon, it is his God-given right to rule Athens. Luckily for the lesser nobility, such as myself, he choose to create Areopagus, which show that he trusts the gods to give their grace to the right individuals.
This system works right now, but I do believe that when our empire grows, it should change. I imagine a system where we have an Autokrator as the supreme ruler of our nation, an absolute monarch if you will.
The title of Autokrator would be hereditary, as only the gods have the right to decide who would be the absolute ruler of our great nation. If there is no Autokrator, an Archon would be raised to Autokrator, by the vote of all current Archons. The "power" of an Archons vote would depend on the power of the cities of the Archon.
As the leader of our nation, it is the right of the Autokrator to decide on matters such as foreign policy.
An Autokrator would be able to hold cities and tiles. They can have Archons, Dukes, and Counts as vassals.
Under the Autokrator, we would have the title of Archon. An Archon is an individual who controls one or more cities, but the way the control of the city is passed upon an Archons death may very well vary from city to city. An Archon, unless otherwise specified, have the last word regarding construction in cities he rule, and he rule the military units which belongs to his city as he wishes.
An Archon can control cities and tiles. They can have Dukes and Counts as their vassals.
After the Archon, we have the Dukes. A Duke is a person who holds three or more tiles. The way these tiles was acquired does not matter.
How much power a Duke have will probably vary from city to city.
A Duke can hold tiles, and they may only have counts as vassals.
And at last, we have Counts. A Count is a person who holds one or two tiles. Should they acquire a third tile, they will become a Duke.
The power of Counts is most likely different from city to city.
Vassals are when a person with a lower noble rank accepts hegemony of a person with higher rank. The Autokrator is automatically the liege of anyone who has no lieges. However, an Archon is not automatically the liege of anyone who holds tiles within the radius of their city.
When a person is a vassal of someone, they agree to pay them a certain part of their income, in addition to provide a part of their levies during wartime. In return for this, it is the duty of their liege to protect them from foreign invaders.
Should a heir happen to have a different liege than his father, the closest relative who has the same liege as the current noble inherit. If a noble has no living relatives who shared his liege, the liege will inherit his lands upon death.