i beg the lords; is this MTW-question?

for MTW:

no, where your capitol is, has no noticeable meaning. it changes due to the number of buildings you have there.(not the development-level, total!)

but where your king is...->

most often i got this *capitol-change* while raising many religious buildings + cathedral(16 turns),while the other provinces keep growing with a normal rate of 4/6/8 turn buildings