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Ragnar was born Ragnar Thunderfist on [[Fenris]], a barbarian of the Thunderfists tribe. When he was still a teenager, his village was attacked by a rival tribe, the Grimskulls, who slaughtered his family and most of his tribe. Despite his youth, Ragnar showed extraordinary fighting talent, using berserker-like rage to slay many of the invaders. He finally fell in combat with the Grimskull youth who had killed his father, [[Strybjorn Grimskull|Strybjorn]], though Ragnar dealt him a mortal wound in kind. Because of their equal ferocity and fighting skill, both youths were selected by the [[Wolf Priest]] [[Ranek]] to join the ranks of the [[Space Marines]], and their lives were saved by the medicine of the Astartes.{{Cite ThisFn|12a}}.

Ragnar was sent to one of the training camps on Fenris, and was eventually sent through the [[Gates of Morkai]], in which he was subjected to psychic interrogation, searching for any hint of taint. His hatred for Strybjorn, against whom he had sworn revenge, was almost his undoing, but he did not give in to the wolf spirit and was allowed to drink from the [[Cup of Wulfen]]. At the end of his initiation rite he returned to the Chapter's fortress of [[The Fang]] bearing the pelt of a blackmaned [[Fenrisian wolf]], a notoriously vicious breed.{{Cite ThisFn|12b}}.

While still in training at the [[Fang]], Ragnar's [[Blood Claw]] pack stumbled onto a secret base beneath one of [[Fenris]]'s mountains being used by the [[Thousand Sons]] [[Chaos Space Marines]]. Ragnar and Strybjorn confronted the [[Chaos Sorcerer|Sorcerer]] [[Madox]], and together managed to banish him back to the [[Warp]].{{Cite ThisFn|12c}}Ragnar also fought in [[Magdelon Incursion]] in 712.[[M41]]{{Fn|5}}

Ragnar's [[Blood Claw]] pack's first mission off-planet was to assist and escort [[Inquisitor]] [[Sternberg]], an old ally of the [[Great Wolf]] [[Logan Grimnar]], in tracking down an [[Eldar]] talisman which Sternberg believed was crucial to stopping a plague on his home planet. The talisman's pieces were scattered throughout the galaxy, taking Ragnar and his Claws to a world overrun by [[Ork]]s, where they slew a massive [[Warboss]] gifted with [[psyker]] powers, and a [[Space Hulk]] infested with [[genestealer]]s. The final journey of their quest took them to Sternberg's home planet, where they confronted the [[Daemon]] [[Botchulaz]], who had almost escaped the prison the Eldar had fashioned for him.{{Cite ThisFn|13}}.

Ragnar's actions won him great renown, and he was inducted into the [[Great Company]] of [[Wolf Lord]] [[Berek Thunderfist]]. Soon a great portion of the [[Chapter]] was deployed to [[Garm]], where a [[Chaos]]-fueled uprising had stolen the [[Spear of Russ]], a sacred relic of the Wolves. During the climactic battle, Ragnar was again confronted by [[Madox]], who was conducting a ritual to raise fallen [[Thousand Sons]] again and to summon his master, [[Magnus the Red]], into the [[Materium]]. In a desperate action, Ragnar threw the Spear into the opening warp rift, preventing Magnus's return.{{Cite ThisFn|14}}.

While many, including [[Logan Grimnar]], believed it to be the only way to save the chapter from annihilation, Ragnar was despised by many for the seeming loss of the relic to the enemy. As a symbolic punishment, Ragnar was assigned to the [[Wolfblade]] on [[Terra]], a bodyguard unit for Lady [[Gabriela Belisarius]], an important scion of an allied [[Navis Nobilite]] house. There, he foiled an assassination plot by a rival House, and defeated the [[Imperial Assassin]] [[Xenothan]] in the process. As a reward, the Navigators gifted him with the ancient [[Frost Blade]] that he continued to use for the rest of his life. While accompanying Gabriela on an inspection tour of their holdings on [[Hyades]], Ragnar was caught in the middle of a plot by [[The Fallen]], allied with a resurrected [[Madox]], to foment war between the [[Dark Angels]] and the [[Space Wolves]]. Ragnar formed a temporary alliance with a rival Dark Angel, [[Jeremiah Gieyus]], that helped defeat the Fallen's commander and encouraged a truce between the two chapters.{{Cite ThisFn|15}}.

In the midst of the brutal [[Chaos]] attack on the Wolves protected world of [[Charys]], Ragnar led a strike team to the mirror world version of Charys, with the aid of the lost [[Thirteenth Great Company]]. There, he confronted Madox yet again, killing him with the Spear, interrupting the ritual, and returning with the Spear to Grimnar.{{Cite ThisFn|16}}

===Later HistoryTrial of the Flesh Tearers===In 960.[[M41]] while aboard the ''Veregelt'', Ragnar in engaged in a ritual honour duel with a [[Dark Angels]] Champion, killing him in a fit of rage despite agreeing to first blood prior to the match. This creates further animosity between the two chapters{{Fn|6b}}, leading to Ragnar agreeing to a second duel to the death with the Dark Angels [[Space Marine Sergeant|Sergeant]] [[Sorael]] to settle the matter. However before the duel can begin, the Imperials are ambushed by [[Night Lord]]s warships.{{Fn|6c}} Afterwards, Ragnar and his squad board a derelict [[Flesh Tearers]] ship ''Baryonyx'', leading to a clash with one of the maddened warriors found in stasis within.{{Fn|6d}} In the subsequent council with Berek and his Wolf Guard, the fate of the Baryonyx is discussed. Some wish to return the ship to the Flesh Tearers, while others want to keep it for themselves. Ultimately [[Ulrik the Slayer]] arrives and decides to return it. Ragnar alongside fellow Wolf Guard [[Nalfir Razortongue]] are assigned to the mission to return the ship to the Flesh Tearers at [[Cretacia]].{{Fn|6d}} Upon arriving at the Flesh Tearers homeworld, Ragnar is nearly executed on the spot for being a Space Wolf by the [[Chaplain]] [[Scarath]].{{Fn|6e}} Instead, they are banished to the harsh wilds of Cretacia in a test of survival and meet Sergeant [[Vorain]], who is seeking to mend ties between the two Chapters.{{Fn|6f}} Before the trio can be extracted via gunship, a large pteradon attacks the group. Nalfir is killed slaying the beast, and Ragnar alongside Vorain later return to Fenris with his body. Vorain then acts as an emissary between the two chapters.{{Fn|6g}} ===Jarl===

Ragnar was one of the few, if not the only, Space Wolves to completely bypass the rank of [[Grey Hunter]], being elevated from a [[Blood Claw]] straight to the rank of [[Wolf Guard]] in Berek Thunderfist's entourage. This incredibly rare feat was achieved after Ragnar single-handedly killed [[Ork]] [[Warboss|Warlord]] [[Borzag Khan]] and his entire retinue in close combat.{{Cite ThisFn|17}}

When Berek was killed in single combat with the [[Chaos]] champion [[Ghorox Bloodfist]], it was Ragnar who hunted down and slew his former Lord's killer. As a result, Ragnar was elevated to Wolf Lord and took command of Berek's Great Company. He is the youngest battle-brother to ever reach such a rank{{Cite This}}. Ragnar also fought in [[Magdelon Incursion]] in 712.[[M41]]{{Fn|56a}}

According to some sources, Ragnar was recruited by [[Ulrik the Slayer]], who also recruited [[Logan Grimnar]]. However, this is contradicted by the novel series, in which Ranek Icewalker recruits Ragnar, and also plays a similar role to Ulrik's as a close advisor to Grimnar.{{cite this}}