Galedan was a Captain in the Dark Angels Legion during the Great Crusade, when he served under Chapter Master Astelan and acted as his second in command aboard the Battle Barge the Spear of Truth. During the Crusade he would take part in invading the world of Byzanthis after the diplomatic efforts of Chapter Masters Astelan and Belath failed to bring it peacefully into the Imperium.
- 1: Call of the Lion (Short Story) — Tales of Heresy (Anthology)
- 2: Master of the First (Audio Drama)
- 3: The Horus Heresy: Legions