Space Marine primarchs like Roboute Guilliman are crucial Warhammer 40k and Horus Heresy characters - here's everything we know about them.
Games Workshop Warhammer 40k - Space Marine Roboute Guilliman
Arks of Omenw: Warhammer 40K's grimdark setting is getting even worse - Polygon
Warhammer 40K: Where Are All The Loyalist Primarchs - Bell of Lost Souls
The Primarchs (20) (The Horus Heresy): McNeill, Graham, Thorpe, Gav, Kyme, Nick, Sanders, Rob: 9781849709842: : Books
We Asked Forge World How They Designed All 18 Primarchs - Warhammer Community
All 20 Warhammer 40k primarchs and where they are now
Primarch - Warhammer 40k - Lexicanum
All 20 Warhammer 40k primarchs and where they are now
Warhammer 40k Primarchs if they were Explained by Jordan Peterson