The Risen (Dark Angels)
The Risen are a faction of Dark Angels. Formerly part of the Fallen, they now faithfully serve their newly-returned Primarch as part of his forces in the Lion's Protectorate. They serve as his bodyguard and entourage, though they also serve as his emissaries and field commanders if the need arises.
History
The Risen were unofficially formed when the Dark Angels Primarch Lion El'Jonson woke up from his 10-millenia nap and vision quest, and found how much the Imperium, ESPECIALLY the half he had woken up in, had gone to shit in the time he had been asleep. Though it started with just Zabriel, by the Lion's own decree it is open for all non-Chaos aligned Fallen to join, and since then has grown to almost a score or so Heresy-era veterans.
Though many joined for their own reasons, they are all loyal to the Lion and the Imperium, regardless of what the modern Dark Angels feel about the matter.
Notable Members
Arthurian References Ahoy!
Many of the named Risen are references to King Arthur's Knights of the Round Table -- specifically Ector, Lancelot, Percival, Bors, Galahad, and Bedivere. Though it still begs to be seen if they'll completely mirror the Knights that they references, but that's a possible Black Library story on its own right?