Leman Russ, also known as the "Wolf King" and the "Great Wolf" during his lifetime, is the currently missing Primarch of the Space Wolves Chapter of Space Marines. He led the Space Wolves Space Marine Legion during the Great Crusade and the Horus Heresy and is famed in Imperial history for his hatred of psychic powers and sorcery, whose use in battle he viewed as dishonourable and unworthy of true warriors. After receiving a disturbing vision in 211.M31, Leman Russ disappeared with the warriors of his bodyguard, his destination and fate unknown.
Russ, along with his brother Primarchs Angron and Vulkan, were considered to be the greatest warriors one-on-one amongst the Primarchs. Known for his fierce and sometimes barbaric personality, Leman Russ considered himself the Emperor of Mankind's most loyal son and executioner. he viewed his role as unquestionably carrying out the punishments requited by the Master of Mankind. Among the forces of Chaos he was known as "the Brawler."