As you can see in the screenshot, my sovereign is outside my city. But when I select my city, it looks as if there are 5 sovereigns inside as well. When I started this game, there was a spiderlair just to the right of the city and two spiders roaming around as usual. Every time I attack a spider that's on the city square, the sovereign is added to the city screen. After I defeated the spider, another sovereign is added. I can only select one sovereign to get out the city and the others just stay there.