The 19th Founding of Space Marine Chapters occurred during the mid-36th Millennium.
During this Founding the Avenging Sons were created from the gene-seed of the Ultramarines.
- Imperial Armour - Volume Three - Taros Campaign
- Insignium Astartes, pg. 60
- Index Astartes, "Steel Confessors," A Games Day 2005 hand-out
- Dark Imperium (Anthology), "Apothecary's Honour," by Simon Jowett
- Heroes of the Space Marines (Anthology), " Renegades," by Gav Thorpe
- Warhammer 40,000: The Battle for Kalevala