Changes

The Fifteenth Legion was formed on [[Terra]], their [[gene-seed]] being created and implanted in the first legionaries during a brief resurgence of [[warp-storms]] within the boundaries of the [[Sol]] [[system]] itself. This brief warp-storm was said to have generated psychic flashpoints all across Terra's globe, resulting in outbreaks of madness, suicide , and random violence. Whether it had any effect on the legion's gene-seed is doubtful, but upon learning of it years later Magnus himself considered it to be a poor omen.{{Fn|3a}}

At least part of the initial crop of legionaries—termed '''student-aspirants'''—were found amongst the population of the once geo-political entity known as the [[Achaemenid Empire]]. This area of Terra had been under the rule of the [[Emperor]] for at least a century at this point, and as a result had suffered little during the just-completed [[Wars of Unification]]. The Emperor himself, accompanied by a retinue of scientists, visited the region and had each and every family tested for compatibility with the XV Legion XV gene-seed. Those that were found suitable were taken to the gene-laboratories underneath the Himalayas to begin their transformation into [[Astartesastartes]]. Present as one two of these first student-aspirants was were [[Ahzek Ahriman]] and his twin brother, [[Ohrmuzd Ahriman|Ohrmuzd]].{{Fn|3a}} Upon completion of this process , the Fifteenth Legion was used to quell what few pockets of isolated resistance to the Emperor's rule remained upon on Terra, before being named the Thousand Sons by the Emperor himself and sent out into the [[galaxy]] as part of his [[Great Crusade]].{{Fn|3a}} Their name is believed to originate from the first step of the Legion's creation process; for unknown (but presumably notable, if the Legion was named because of them) reasons, exactly one thousand [[Marinemarine]]s were created and trained first, with the Fifteenth brought up to full Legion numbers afterwards.{{Fn|7b}} There only being ''one thousand'' Thousand Sons in existence at a point in time is a fact that, tragically, would repeat itself in the future on more than one occasion...{{Fn|1}}{{Fn|3a}}