The Blood Angels were created from the genetic material of their Primarch Sanguinius. As with all of the Primarchs, Sanguinius was genetically engineered to be a supreme super-soldier but was cast into the warp during his infancy along with his brothers, and found on the nuclear-blasted moon of Baal Secundus.
Sanguinius was affected by the warp, and when he was found by one of the few unmutated human tribes on Baal, he had a pair of angelic wings growing from his back. As he matured quickly, he was able to use his superhuman powers and abilities to unite the humans of Baal against the mutants and become their leader.

When the Emperor found Baal in his search for the twenty Primarchs, Sanguinius immediately recognized him for who he was and bent down on his knee, pledging his service. In this, Sanguinius was one of the few Primarchs who did not challenge the Emperor upon their reunion. The Emperor then took Sanguinius and a number of his best warriors and placed him in command of the Blood Angels Space Marine Legion.

During the Horus Heresy, the Blood Angels were one of the few Legions who fought alongside the Emperor during the Battle of Terra. When Horus lowered the shields of his battlebarge and the Emperor teleported aboard the ship, Sanguinius was with him.
The noble Primarch became separated from the Emperor and came across Horus alone. The Warmaster tried to sway Sanguinius and turn him to Chaos, but the Angel-winged warrior refused, and attacked Horus. The Daemonically strengthened Horus slew Sanguinius, as the Primarch knew he would. He had foreseen his death, and yet still engaged the Arch-Heretic, knowing he would die.
This has endowed many of the Blood Angel's beliefs with a deeply mystical streak. Sanguinius' violent death left a strong psychic imprint on his Legion, since they partially share his DNA. However, this was a willing sacrifice that was made in order to buy the Emperor time and to give Him a weakness in Horus's armour, which was key in bringing about the traitor's defeat.

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