Dziadu_Swierznowski 说:
You can relocate your capital anytime you wish. You just need silk and tools.
The items you need to relocate your capital change (sometimes it's wool cloth, sometimes wool
bundles, sometimes linen, etc.), but yes, you can relocate any time you want.
Where you start depends on quite a few factors: the troops you use, the type of fighting you like to do, the terrain you like, etc, as pointed out by other posters.
I've had good luck with taking Narra and starting my kingdom there. It tends to be a rich city in many games, despite randomization, because its wealth depends more on caravans than on its villages so even if they're raided often, it stays rich. It's an easy city to siege just in general, helped by the fact that Khergits tend to suck in sieges. It's usually far enough away from the Steppe Bandit lair for them not to be such a nuisance, and pretty central to northern Calradia, especially if one uses Vaegir, Swadian, Khergit, or Sarranid troops. Halmar is also nearby, also easy to siege, and also usually rich.
I found it to be easy to expand and take over the Khergit regions, and they're pretty well-protected between two mountain ranges; with only a few passes in between, you can focus more on the open area facing Swadia. I also preferred open-field fighting to mountain fighting, and was using mostly Vaegir troops, so that factored in, as well. Expanding to Tulga and controlling the spice trade also helped my economy immensely.