Board Thread:Warhammer 40k General Discussion/@comment-18016240-20140707161751/@comment-195.177.85.201-20150313183206

Here is the official order of rediscovery of the Primarchs by GW: http://warhammer40k.wikia.com/wiki/Primarchs

I think that the oldest (or one of) Chaos SM will be Ahzek Ahriman from the Thousand Sons Legion. He was born on Terra in the 30th Millennium and fought alongside the Emperor at the start of the Great Crusade.

The other choice is Merir Astelans from the Dark Angels (a fallen one), who was among the first Astartes of the I Legion at the time of its founding. At the other hand after the Fall of Caliban Astelan was sucked into the warp and emerged only in second half of 41st Millenium.

The man who longest live outside of warp will be probably Luther, since he is trapped in a cell in the Rock's dungeons from the destruction of Caliban. But technicaly he is not a space marine but an very augmented human.