Lord Commander of the Imperium

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Lord Commander of the Imperium is the highest known military rank within the Imperial hierarchy, second only to the Emperor himself.^[2] The first known holder was the Primarch Rogal Dorn, who had the title during much of the Horus Heresy but later ceded it to Roboute Guilliman.^[5] After the Heresy Guilliman took command of the entirety of the Imperial armed forces and took the title of Lord Commander in order to stabilize the Imperium and begin the reforms for which he is famous. He was the only person in the history of the Imperium to control all of the Imperial armed forces (before this, the Imperial war machine was administered by the War Council). The Lord Commander of the Imperium was one of the High Lords of Terra during its use. ^[1]

Even after Guilliman's wounding at the hands of Fulgrim, the title of Lord of Commander of the Imperium was still used and its holder served as both chairman of the High Lords and commander-in-chief of the Imperium's disparate military forces. In honor of the Primarch, the Lord Commander was often simply referred to as "Lord Guilliman". The title is no longer used as of M41, but continued at least until mid-M32. Known holders of the title during this time include Udin Macht Udo^[2] and Chapter Masters Koorland and Maximus Thane. In the aftermath of the War of the Beast and The Beheading, the position of Lord Commander of the Imperium was abolished.^[3]

Later at the end of the 41st Millennium, the reborn Roboute Guilliman returned to Terra and declared himself Lord Commander once more.^[4]

Sources

• 1: Codex: Ultramarines (2nd Edition), by Rick Priestley, ^{[Needs Citation]}
• 2: I Am Slaughter (Novel), Chapter 3
• 3: The Beheading (Novel) ^{[Needs Citation]}
• 4: Gathering Storm: Rise of the Primarch, Part 3
• 5: Master of Mankind (Novel), Chapter 3