Thrain was settled by humanity as part of a peace agreement with the Sun Elves and Dwarves. Thrain has served as mediators for many of the races in Hellan and later became a driving force for the foundation of the Confederacy.
Trivia
Bastards of noble lords are given the surname 'Thrain' to denote their lineage, and importance. They typically serve as ambassadors, because they are both important yet expendable.