Sanguinius 11th son of the god emporer the noblest of them all.killed by horous during his heresy. Sanguinius consided the noblest of all primarchs. Had only one secret,he had more than just his gene seed children the blood angels.
During the great crusade Sanguinius took the hand of a noble woman aboard his ship the red tear though it was short lived as she died during childbirth.
Not wanting the emporer to know of his folly the child was given to the care of 8 blood angels, 40,000 battle sisters, and 50,000 imperial soilders. All marked as died in a battle against demons.
Along with orders that the child and his descendants would have control over the planet slain.
The child was also give. A full STC and several gene and tech prists. To help him and the planet grow. over the next several centuries the planet remained a secret from the emperium. But as the planet grew and flourished from well maintained hive cities and perfectly modified flora and fauna which kept the planet beautiful. The desendents of the child grew tired and bored many succumbing to chaos. It was only after the death of sanguinious that things started to change. Some became made fuled with rage using their authority to slaughter . Some sprouted fangs and wings going into a blood frenzy many had to be captured and locked away. But out of all the mutations one made the blood angels the most frightened. One was able to completely keep his sanity and only experienced minimal mutations that being short fangs that escreted a aphrodisiac posain and blood red eyes. Under his orders all of his family members were rounded up and put into stasis till a cure could be found.his name was Agios slain.