Gravis Ninth
From Warhammer 40k - Lexicanum
The Gravis Ninth was an Imperial Army Regiment, that defended the Imperial Palace during the Horus Heresy's Siege of Terra.[1]
History
When the Imperial Palace's Sanctum Imperialis sealed its doors, though, the Gravis Ninth was among the Imperials who were left outside its walls to face the overwhelming numbers of Warmaster Horus' Traitor forces. Some members of the Regiment later joined Sigismund's Seconds, which was an army of various Imperial forces, led by the Emperor's Champion Sigismund.[1]