2. Some rebel held cities are allied, through the script, to certain factions. Taking Sinope will cause the Koinon Hellenon to declare war on you as the inhabitants plea to their athenian or spartan cousins for help. You will be warned by the advisor if you step to close to such a city.

3. There have been many lists of the internal and external names. Go to wikipedia and look on the page for Europa Barbarorum, you'll find the list there.

4. Client rulers don't get descendents as they don't belong to a family tree. They exist and then they die, they have no family.

5. No idea then. That is not something we have changed as far as I know, at least not intentionally.

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