Quote Originally Posted by Centurio Nixalsverdrus
Thats funny because I (Makedonia) recently wanted to bribe Singidunum (Getai), but couldn't. There was no "Bribe" option in the diplomacy menu!
There was probably a family member in the city ... some cannot be bribed ... but this is limited to the faction leader and faction heir as far as I know. So if you are afraid that a particular city will be bribed you might place one of these of your own in there.