The getai potential uniter trait says you need:

To become "Pavel-ter", Sovereign of all Thracians, this man must rule Buridava, Sarmiszegethusa, Kallatis, Nikomedia, Naissus, Byzantion, Tylis, and Chersonesos
As my guys keep getting killed by horse archers up there I thought I'd check out the trait triggers. Some of them mention Byzantion *and* Chersonesus, while some just mention Chersonesus.

Only a minor thing but I'm hoping there was a mix-up between the region name of Byzantion (Chersonesus Thrakia IIRC) and the city of Chersonesus so I can mod the trigger myself and don't have to fight those nasty horse archers any more.

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Also, the "Nikomedia" mentioned in the text description is called Nikaea (or something close) in the game.

(Pretty minor but might confuse people who didn't know thracians lived there.)