I want my Capitol back!

[Col]

Help!
I lost my capitol to barbarians around turn 20. When I retook it it was no longer marked as my capitol city, and my other cities still had the -3 happiness penalty.
I have now researched writing (the requirement for building capitols) but still don't have the option to rebuild my capitol anywhere. Meanwhile, my citizens are getting dangerously close to a revolt.

Has anyone else encountered this problem, and is there a solution out there?

[Maquiladora]

What mod is that?

In the un-modded game you need Feudalism to rebuild your Capitol.

[Col]

I'm playing with the city-expansion mod (which I don't think messes around with the tech-tree).
I think I also have the mod, whose name escapes me, which is the standard bug-fixing one.
Having not reached Feudalism yet I may be fussing about nothing, but at present I can only go on what the Great Library tells me - and it tells me all I need is writing.

[MrBaggins]

Just look in the buildings.txt (as appropriate for the mod... which I believe is just buildings.txt in this case)... thats what takes precedence... the GL could be (and is in this case) wrong