Alpharius

The Primarch of the Alpha Legion - who turns out to be twins.

Alpharius is the Primarch of the Alpha Legion, the 20th and last of the Space Marine Legions. The novel Legion reveals that the Legion's Primarch is actually a pair of twins, Alpharius and Omegon, publicly a single figure named Alpharius Omegon.

Lore & Background

Legion, set about two years before the Heresy, describes the events that lead the twins to support Horus. During the Heresy Alpha Legion operatives create the warp storms that cut off the Chondax system and attack the Space Wolves, and Hunter's Moon tells of the small pack of Space Wolves that Malcador assigned to guard Alpharius, or to slay him if he proved false.