And in this land there are cities called the Cities of Light. None of the knowledgeable people will enter except every chosen one. They are thirteen cities and they are on one roof and their structure is amazing. This is because they went to a place in this land and built there a small city with great walls in which a rider can walk if he wants to turn around. It was a journey of three years, and when they established it, they made it a treasury for their benefits, interests, and numbers, and at a distance from its sides they erected towers that towered above the towers of the city with what surrounded it, and they extended the building with stones until the city became like the roof of a house, and they made that roof land. On it they built a city greater than the one they had first built, and they inhabited it, and they made it a dwelling place, and it became narrower for them, so they built. There is another city that is larger than it, and its inhabitants are still increasing,