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==History==
For ten thousand years from the [[Great Crusade]] until the end of the [[Thirteenth Black Crusade]], the Firstborn were simply the [[Adeptus Astartes]]. However following the development of [[Primaris Space Marine]]s by [[Belisarius Cawl]] the "Firstborn" as they became known faced the prospect of obsolescence at these larger, physically stronger, and mass produced warriors.{{Fn|4}} Originally , in the early stages of the [[Indomitus Crusade]] , most Primaris were produced by Cawl himself and , though developed by the [[Gene-Seed]] of the [[Primarch]]'s , lacked a distinct identity, instead being gathered in armies known as the [[Unnumbered Sons]]; however, as the Crusade progressed, the Unnumbered Sons were distributed to either new [[Chapter]]s of the [[Ultima Founding]] or into existing Space Marine Chapters.{{Fn|2a}}
Even though 94% of [[Chapter]]s have accepted Primaris Marines into their ranks{{Fn|2}} Firstborn-Primaris relations have had issues. To many, the Primaris were new arrivals often recruited away from a Chapter's [[Adeptus Astartes Homeworld|homeworld]] and new to the culture, traditions, and ways of the Chapter. Many arrivals from the [[Unnumbered Sons]] into existing Chapters felt like strangers.{{Fn|2b}} When some Firstborn first saw the Primaris, they regarded them as mutants.{{Fn|4}} This tension was exemplified in the [[Space Wolves]], where many [[Wolf Lord]]s resisted accepting Primaris Space Marines.{{Fn|3}} In the [[White Scars]], many Firstborn saw that these warriors were not of [[Chogoris]] nor knew the ways of their Chapter's culture, but at the same time understood the necessity of Primaris Marines in defending the [[Imperium]].{{Fn|4}} Notable Space Marine officers who have openly expressed distrust of Primaris Space Marines are [[Flesh Tearers]] [[Chapter Master]] [[Gabriel Seth]]{{Fn|9}} and [[Raven Guard]] 9th Company Captain [[Vos Delorn]].{{Fn|8}} In the [[Unforgiven]], there was much hesitancy over allowing Primaris Marines into the [[Inner Circle]].{{Fn|10}}
