Sanguinius
Sanguinius was (and that 'was' is quite significant) the Primarch of the Blood Angels Space Marine Chapter. He was notable for the fuckhueg angel-like wings that mutated out of his back during his childhood on his home planet, Baal, as well as his heroic deeds during the Great Crusade. Unfortunately, Sanguinius was slain by Horus during his eponymous Heresy, though it is widely believed that it was Sanguinius' weakening of the Arch-Traitor which made it possible for the Emperor to shut Horus's big, stupid, heresy-spewing mouth once and for all, and thus save mankind from the clutches of Chaos.
Origins
Like the rest of the Primarchs, Sanguinius was bio-engineered on Terra to serve as a general in the Emperor's armies, and was stolen in his infancy and carried away across the galaxy by daemonic agents of Chaos in an attempt to foil the Emperor's efforts to unite humanity. Landing on Baal, he was found by the Folk of the Blood, a local tribe who raised him to manhood. They were going to kill him for being a mutant, but when it became clear that Sanguinius was a badass warrior-prodigy the likes of which they'd never seen, they decided he was worth keeping. After all, Sanguinius was actually a pretty nice guy for 40k, and he was pretty handy at fighting off those other mutants that kept attacking them from Baal's radioactive deserts, which he could walk through without any protection. As such, Sanguinius quickly ascended as a leader among the tribes of Baal and drove back the hordes of mutants threatening their hold on the world, eventually attaining a near god-like status among the planet's denizens.
After the Emperor found Baal and bade Sanguinius to assume his rightful place among his armies, Sanguinius wept a single tear of joy because he's manly enough to be in touch with his feelings, and bowed before the Emprah. (Of the canonical Space Marines, his chapter is to this day one of the most batshit-loyal to the Emperor.) The greatest of Sanguinius' tribal warriors were extended the honor of joining the Adeptus Astartes, and were thereafter implanted with the gene-seed drawn from Sanguinius' genome. These men became the first members of the ninth Space Marine legion to be founded, and the Blood Angels were born.
The Great Crusade
Joining the Great Crusade, Sanguinius became best buds with fellow Primarchs Horus, Roboute Guilliman, and Rogal Dorn. Ironically (and later, tragically), his friendship with Horus is said to have been closer than that of any of the other Primarchs. Which, this being 40k, went straight to hell when the Horus Heresy started. He was easily the most fabulous of all the Emperor's generals; he wore a glowing, ornate set of golden artificer armor adorned with huge rubies which represented Terra, Baal, and Baal's moons, and his magnificent white wings would spread behind him as he took to the skies of the battlefield. At the same time, he gave the impression that he'd be happy to cast off his finery, whereas Fulgrim would rather die. Basically, in Sanguinius' case, Geedubs abandoned all pretense of being subtle about the whole "the Emperor is God, the primarchs are the archangels, and Horus is Lucifer" thing—like, to the point that Sanguinius became known simply as "The Angel" among the armies of mankind.
Though not first in favor among the Emprah's Primarchs (that position belonged to Horus, pre-heresy), or the biggest psychic powerhouse, or the best at empire-building, or even the one who looked most like Dad, Sanguinius was said to have the best blend of the Big E's attributes. And while a lot of the Space Marine legions and their generals fought in the Great Crusade just for the sake of glory and a good battle, Sanguinius and his Blood Angels fought for what the Emperor himself did: a better galaxy, a peaceful galaxy, one where humanity would be united, happy, and prosperous. During the Crusade, the Blood Angels formed a friendly rivalry with the World Eaters legion (yet another relationship the Horus Heresy would royally buttfuck), because both were noted for being assault-oriented shock troops; however, while the World Eaters were straight-up lunatics in combat, the Blood Angels' ferocity was mitigated when it needed to be by Sanguinius' wisdom.
Also everyone loved the guy. Literally, even at the depths of his heresy Horus wished Sanguinius was one of his generals. And he was a good guy who doesn't afraid of anything.
Signus Prime and Ka'Bandha
At one point during the Great Crusade, Sanguinius and the Blood Angels were tasked by Warmaster Horus with reclaiming the Signus Cluster from a supposed xenos infestation and liberating the humans there from their oppressors. However, when they arrived, they found that the entire system had been consumed by the evil influence of the Chaos Gods, and specifically a Keeper of Secrets calling itself Kyriss the Perverse. (This was actually a trap set by Horus in an attempt to eliminate Sanguinius early on because he feared him more than any of his other fellow Primarchs. What a pussy.) Long story short, the Blood Angels were caught off guard and lost a lot of Marines, but eventually regrouped and conquered the armies of cultists and Chaos daemons in the Signus system. To top it off, Sanguinius faced Kyriss himself one-on-one and beheaded that sick fuck, promptly ending his rule.
But a greater threat soon emerged: Ka'bandha, a powerful Bloodthirster and one of Khorne's greatest servants, attacked the Blood Angels while taunting Sanguinius and claiming that Horus had betrayed him. Refusing to believe this, Sanguinius attacked in rage, and managed to stab his sword right into the daemon's chest and wound him severely. Ka'bandha roared in pain and lashed out with his whip, ensnaring Sanguinius' legs and crushing them. Then, leaving Sanguinius alive for some reason, he charged off to slay a few hundred Blood Angels. The Red Thirst, already a problem for the Blood Angels, was exacerbated by the psychic shockwaves of this defeat, and Sanguinius vowed that he would take vengeance on Ka'bandha for this atrocity.
During the later Horus Heresy
Along with the Imperial Fists and the White Scars, the Blood Angels were able to make it back to Terra in the closing days of the Horus Heresy to defend it from the traitor legions and their daemonic allies. Sanguinius and his legion led the defense of the Imperial Palace itself when the forces of Chaos closed in around it, and the Primarch slew innumerable daemons, traitors and other assorted scum in the process. Fortunately for Sanguinius, Ka'Bandha also turned up during the battle, and the two went at it again rather majestically atop the Eternity Gate to the Emperor's throne room. Not to be beaten again, Sanguinius managed to SNAP KA'BANDHA'S SPINE OVER HIS MOTHERFUCKING KNEE and hurled the bastard's corpse back into the throng of Chaos filth below, and the Blood Angels who had died by the Bloodthirster's hand were thus avenged in the most spectacularly badass of ways.
But this is Warhammer 40,000, and noblebright doesn't last very long against grimdark, even when it's badass noblebright. Eventually, the Big E himself, along with Sanguinius, Rogal Dorn, Rogal Dorn's mustache, and a contingent of their respective Marines, launched a last-ditch assault against Horus, teleporting aboard his battle barge and taking the fight to the Warmaster himself. As fighting broke out across the capital ship, Sanguinius got separated from the rest of the assault party (THANKS OBAMA!), and when he found Horus, he was alone. Horus, perhaps out of some small, lingering sense of brotherhood with Sanguinius, offered his former friend, for the final time, a chance to turn to Chaos. But Sanguinius said "NEVAH!" and the two Primarchs proceeded to battle for the fate of mankind. Though Sanguinius was one of the most powerful of the Primarchs, he was wounded and wearied from the fight on Terra and already at a disadvantage, and Horus had been granted terrible power by the gods of Chaos to boot. Horus therefore slew Sanguinius so hard that it psychically traumatized the Blood Angels for ages to come, and the Black Rage became the (almost) inescapable mental scourge it is on the chapter today.
Legacy
Although Sanguinius lost to Horus, it is widely believed that the Emperor would not have been able to destroy Horus afterwards were it not for the chink that Sanguinius put in Horus' armour. And it is also widely agreed that if Horus hadn't come to save his legion's ass that day on Terra, it would have been ground out of existence by Sanguinius and the Blood Angels. Lastly, it is also agreed that Sanguinius was tired after several days of fighting (he defied fucking Angron on the battlements!), and if he had been totally refreshed, Horus would have had a lot more than just a chink in his armour. However, in the Horus Heresy Collected Visions, it details the battle between the Emperor and Horus, and makes it clear that the main reason Big E didn't kill him immediately is because he thought he might be able to save him…a hope which was dashed as soon as he saw Sanguinius' body. However, in Visions of Heresy, Big E still held back, even after seeing Sanguinius' body. It wasn't until the Emperor was mortally wounded on the floor that this changed. It says that as he's lying, waiting for the final blow, a Custodian appears and rushes toward him, Horus contemptuously kills the Custodian; a friend of the Emperor for centuries, without barely an effort, laughing maniacally as he did so. It was this utter contempt to taking a life which FINALLY made the Emperor realise there was no saving his son.
In short, if Horus is Lucifer and The Emprah is God, then Sanguinius is Jesus. Sanguinius died for your sins…just like Optimus Prime does on a daily basis.
Sanguinius also bears the distinction of being one of the few Primarchs (alongside Horus, Ferrus Manus and Roboute Guilliman) who were capable of lasting a little more than 3 seconds against Angron, who had Sanguinus' strength but was much quicker to go all-out.
In the 41st millennium, Sanguinius is the Primarch most beloved by the Imperium for his heroic sacrifice (despite what he who shall not be named would say about our Spiritual Liege), and is a hero of the Imperial Cult. Across the Imperium a celebration called the Sanguinala is held in his honor, where adepts wear the iconography of the Blood Angels. A festival dedicated to Leman Russ would have been a better party, but would also have involved more property damage and alcohol-related deaths, and a hell of a lot more fur fags.
The mysterious entity known as the Sanguinor is believed to be the incarnation of Sanguinius' better nature, or the first Sanguinary Guard Herald Azkaellon, miraculously preserved through time. Its actual origin, though, is far more mundane: when Sanguinius was named Emperor of Guilliman's Imperium Secundus, he and Azkaellon invented the figure who could act as Sanguinius' public face and deal with petitioners, whilst Sanguinius himself could be elsewhere, you know...dealing with stuff. In modern 40k, outside of perhaps the Sanguinary Guard themselves, the only "living" person confirmed to know the truth is the Lion, but he's in no position to tell anyone. But since nobody else in the 41st millennium is entirely certain of the truth, it's getting the Inquisition's panties in a bunch. A good thing, too, since Sanguinius' original position of proxy-Emperor was a teensie bit heretical.
It is a well-known fact that every female (human, xenos and daemonette) in the the whole grimdark galaxy wants Sanguinius sexually, including Khorne WHO CALLED ME FEMALE?! and Slaanesh. Many Sororitas (and some Astartes) cry themselves to sleep at the knowledge that they won't EVER BE ULTRAMARINES ever be able to hold his beautiful golden mane as he slays them with his mighty power sword.
Gallery
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Sanguinius gets the bitches. All of 'em.
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Does Sanguinius have to choke a bitch? Yes. *Cue the complete and total curbstomping of the armies of Chaos.
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Sanguinius: The most bishie of bishies.
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Don't you wish your Primarch was hot like me?
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Sanguinius, only slightly less fabulous than usual.
| The Primarchs of the Space Marine Legions |
|---|
 Loyalist Corvus Corax - Ferrus Manus - Jaghatai Khan Leman Russ - Lion El'Jonson - Roboute Guilliman Rogal Dorn - Sanguinius - Vulkan |
 Traitor Alpharius/Omegon - Angron - Fulgrim Horus - Konrad Curze/Night Haunter - Lorgar Magnus the Red - Mortarion - Perturabo |