Primarch

The Primarchs are twenty genetically engineered individuals created by the God Emperor of mankind, who were the progenetors of the Space Marines.

Primarchs are superhuman to an unknown degree. The Imperial Space Marines were created from genetic material extracted from the Primarchs, but the lore implies that the Primarchs are far stronger and tougher than the Marines created from them. Horus was able to fight the Emperor and nearly win, but Horus was receiving additional power from the Chaos Gods at the time.

Some of the corrupted Primarchs are believed to be still alive in the Eye of Terror, but none of the loyal Primarchs are alive and active (although there are indications that they are not all dead, either).

Loyalist Primarchs

• Vulkan (Salamanders)
• Leman Russ (Space Wolves)
• Jaghatai Khan (White Scars)
• Rogal Dorn (Imperial Fists)
• Sanguinius (Blood Angels)
• Roboute Guilliman (Ultramarines)
• Corax (Raven Guard)
• Lion El'Jonson (Dark Angels)
• Ferrus Manus (Iron Hands)

Chaos-Corrupted Primarchs

• Horus (Luna Wolves / Sons of Horus / Black Legion)
• Fulgrim (Emperor's Children)
• Konrad Curze (Night Lords)
• Angron (World Eaters)
• Mortarion (Death Guard)
• Magnus the Red (Thousand Sons)
• Lorgar (Word Bearers)
• Alpharius (Alpha Legion)
• Perturabo (Iron Warriors)

Two other primarchs existed, but all information about them has been lost to history.