From Warhammer 40k - Lexicanum
Thoros was present amongst the Blood Angels contingent during the Council of Nikaea. Thoros was introduced to Magnus, Primarch of the Thousand Sons by Sanguinius. He was described as one of the Blood Angels' most vaunted captains of battle.
- 1: Horus Rising (Novel) by Dan Abnett, Part Three, Chapter 7
- 2: A Thousand Sons (Novel) by Graham McNeill, Chapter Eighteen