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Who Are the Ultramarines?

The Ultramarines are one of the most prominent Space Marine Chapters in Warhammer 40K. They are the descendants of the Primarch Roboute Guilliman and follow the Codex Astartes closely. The Ultramarines are known for their discipline, organization, and strong leadership.

QUICK FACTS

ItemDetail
ChapterUltramarines
PrimarchRoboute Guilliman
HomeworldMacragge
DoctrineCodex Astartes
ReputationHighly disciplined

EXPLANATION

The Ultramarines were originally the XIII Legion during the Great Crusade. After the Horus Heresy, they were reorganized into the Ultramarines Chapter and several successor chapters. Their Primarch, Roboute Guilliman, wrote the Codex Astartes, which became the foundation for Space Marine organization and tactics. The Ultramarines govern the Ultramar region of space and maintain a strong military presence there.

WHY IT MATTERS

The Ultramarines have had a major influence on the structure of the Space Marines and the Imperium’s military doctrine. Their traditions and strategies shape how many Chapters operate.

RELATED LORE

Who Are the Primarchs
What Is the Codex Astartes
What Is a Space Marine Chapter
What Is the Imperium of Man

FAQ

Who leads the Ultramarines?

The Chapter Master leads the Ultramarines, though Roboute Guilliman remains their Primarch.

Why are Ultramarines important?

They helped shape the modern structure of the Space Marines.

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Baron Von Vault Founder & Gaming Systems Analyst
Baron Von Vault is the founder of the Von Vault Network and creator of D4Dead, BorderlandsHQ, and 40KFAQ. He publishes research-driven analysis of action RPG and looter shooter systems, focusing on progression loops, class mechanics, and endgame design.
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