Board Thread:Warhammer 40k General Discussion/@comment-14745711-20140911102114/@comment-6078851-20140911140604

they are two people, twin primarchs, but they only have one soul between them which sorta makes them one being. and because of their legion's thing for secrecy almost no-one knows that the alpha legion has/had two primarchs, I think the only people who know are the legionaires themselves, guilliman who found them and emps.