Is the time frame of this PW situated before/at the same time/ after any of the events of the Campaigns of Nwn, xp1 or xp2?
It would help to know to avoid a few anachronisms.
This PW and Campaign Events
The events of the NWN, SoU, and HotU campaigns did not happen in our campaign setting.
If you want some basic knowledge of Faerûn history: Clicky. Everything there is canon, taken from source books and various Dragon issues and whatnots.