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Grand Master is a rank that some Space Marine chapters use for the most senior ranks of a chapter. Most notable in this is the Dark Angels chapter.

Dark Angels Grand Masters

The Dark Angels maintain a number of Grand Masters which which are the high-ranking leaders of the Dark Angels. Often they lead companies or have special titles and duties as listed below.

• Ezekiel - Grand Master of the Librarians¹
• Belial - Grand Master of the Deathwing¹
• Sammael - Grand Master of the Ravenwing¹
• Azrael - Supreme Grand Master of the Dark Angels¹
• Sapphon - Grand Master of Chaplains²

Other ranks include:

• Grand Master of the Fleet¹
• Grand Master of the Arsenal¹
• Grand Master of Recruits¹
• Grand Master of the Watch¹

Sources

• ¹:Codex: Dark Angels (4th Edition)
• ²:Codex: Angels of Death (2nd Edition)