From Warhammer 40k - Lexicanum
Vargrif was a Colonel in the Mordian Iron Guard who led his Guardsmen in aiding the Knights of House Hawkshroud to defend their Homeworld, Krastellan, against Dark Eldar raiding parties in 456.M38.
As the Knights battled the Dark Eldar, Vargrif and the Mordian Guardsmen protected the Household's stronghold against the Xenos, which led to them foiling a kidnapping attempt against the consort of the 832nd Lord of House Hawkshroud. The Knights and Guardsmen were later victorious over the Dark Eldar and since that day, House Hawkshroud has felt honour-bound to provide aid to any of Vargrif's descendants, should they be called upon to do so.
- 1: Codex: Imperial Knights (6th Edition) — Knight Worlds of the Imperium - Knights at War