Board Thread:Warhammer 40k General Discussion/@comment-112.207.225.45-20160827022941/@comment-7390107-20160829142214

Well here is what is says on the history of Adeptus Custodes, first few lines

" The origins of the Custodian Guard are shrouded in myth and legend. The Custodes were founded by the Emperor of Mankind at an unknown date before the Unification Wars  on  Terra  sometime during the latter years of the  Age of Strife, and since then have maintained a constant vigil over his person. During that time they had yet to be given the title of Adeptus Custodes and were instead variously known as the Emperor's Companions, the Immortal Guardians and the Emperor's Bodyguard, and later on, as the Legio Custodes."

And on Thunder Warriors page

" The  Thunder Warriors  were the genetically-engineered warriors of  Terra  created by the  Emperor of Mankind  to unite the homeworld of humanity beneath his rule in the 30th Millennium. They were the first gene-enhanced warriors created by the Emperor and served as the precursors to the present-day  Space Marines ."

I dont' know if im wrong but somehow i got a felling that the Thunder Warriors were the first.

This dosen't mean im right but also see the these statements are contradicting each other since both state they were first...

But in terms of combat abilites Adeptus Custodes are the best that's for sure.