Bactria could be a copy of Parthia (I am not at home, I can't have a look, you could check in the scen-file via text editor) or Scyths.... but I think Parthians. So you'll find their UBs and UUs there.
RFC is nice, but for me RFC is just a scripted game where CIVs changes due to scripting. Only time/turns is the reason of their changing not a bad government or other influences (invasion, natural disasters, war). It would make more sense for me, if eg when I play Rome, my CIV just gets recalled to Byzanz instead of having a new start losing all my actual territory and cities.