I'll give it a shot. Cultural differences can be the cause of wars, as can diplomatic incidents & assassinations; or maybe Phoebus's people were Wraith worshippers who tried to take over Thalen's planet for the Wraith(or vice versa); it's also possible that one of their peoples' were conquerers(before the Wraith came along)& so the other people were resistance fighters; that's all I can think of right now. This continues to be a great story. Please update very soon.
Author's Response: Interesting idea, but I'm generally trying to avoid the Wraith as an explanation for the conflict; given their level of technological development, I've always assumed that they didn't have much contact with the Wraith (As well as the fact that it lets me explore the idea of PEOPLE being a problem even without alien interference), but the suggestion is appreciated, I assure you.