As for Parthia satrapies, im in the 43 turn now and 11 settlements, 16 total as Parthia has a millitary aliance with Dahae who have also expanded, and until now, i have destroyed 4 factions.
The first 3, when i captured their last settlement, as i have allready posted, the options i had were, occupy, loot and raze.
Last night i captured the last settlement of Media Apopatene and miracle, i have an aditional option, to turn them into my satrapy..

Has anyone an idea why is this happening? Is it the turn, the no of settlements?