Hrm, well, that's unfortunate, although very helpful. Then that means Urth is either of Allagan nobility or of some as-yet-unnamed civilization. Still, the phase "...countless multitudes of her people" makes it sound like she was some sort of leader... So, that may very well mean that she's neither Allagan or noble. For all we know she was a skilled sorceress and her followers were students of her art. After all, if the Sightseeing Log tells us history as it is, that's pretty damn impressive to be able to seal an Elder Primal away (albeit at the cost of her life), and people with that kind of power tend to attract followers.