Lord Commander of the Imperium is the highest known military rank within the Imperium of Man's military hierarchy, second only to the Emperor himself. 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.

帝国领主指挥官是人类帝国军事等级中已知的最高军衔，仅次于帝皇本人。第一个已知的持有者是原体罗格·多恩，他在荷鲁斯叛乱的大部分时间里拥有这个头衔，但后来将其割让给了罗伯特·基里曼。

After the Heresy Guilliman took command of the entirety of the Imperial armed forces and took the title of Lord Commander 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. 

叛乱之后，基里曼指挥了整个帝国武装部队，并获得了领主指挥官的头衔，以稳定帝国并开始他著名的改革。他是帝国历史上唯一控制所有帝国武装力量的人（在此之前，帝国战争机器由战争议会管理）。帝国领主指挥官在使用期间是泰拉的高领主之一。

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 and Chapter Masters Koorland and Maximus Thane. The position of Lord Commander of the Imperium was used for at least a century after the War of the Beast and The Beheading. By the time of the Age of Apostasy, the office was no longer a position of the High Lords.

即使在基里曼在福格瑞姆手中受伤之后，帝国领主指挥官的头衔仍然被使用，其持有者既是高领主的主席，也是帝国不同军事部队的首席指挥官。为了纪念原体，领主指挥官经常被简称为“领主基里曼”。从M41开始，这个头衔就不再使用了，但至少一直持续到M32中期。在此期间，该头衔的已知持有者包括乌迪恩·马赫特·乌多、战团长库兰德和马克西姆斯·塞恩。在野兽战争和斩首之后，帝国领主指挥官的职位至少使用了一个世纪。到了叛教时代，这个职位不再是高领主的席位。

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

后来在第41个千年末，重生的罗伯特·基里曼回到泰拉，再次宣布自己为领主指挥官。