Lorgar
From Warhammer 40k
The infant Lorgar was found on the planet Colchis during the scattering of the Primarchs. The Primarch matured quickly and was adopted into the planet's wide spread cult. The Primarch rose quickly through the hierachy of the religion and only the high priest Kor Phearon, stood above him.
Soon after the Emperor came, seeing the Emperor as such a divine being, Lorgar bowed down and worshipped him. The Emperor who had banned all forms of religion in the Imperium looked upon him and said 'my son, i do not wish to be worshipped, i want to be obeyed.' Lorgar was hurt by this comment but vowed that he would stop. The Emperor gave Lorgar the XVII legion as his own.
Shortly after the Emperor departed, Lorgar began his worship again and it began to spread quickly, reaching from fleet to fleet, planet to planet. Lorgar began his book 'the book of Lorgar.' This was a text that told the people how the Emperor was to be worshipped. When the Emperor found out of this he was outraged and told Lorgar to stop immediately. Lorgar became angry with his father's wishes. Soon after, the legion's high Chaplain Erebus (who was tainted by the High Priest Kor Phearon) told Lorgar of a much higher power who wanted to be worshipped. Lorgar began his worship of the gods of Chaos. Soon after Lorgar was told that a galaxy wide civil war was to happen, and he was to be the cause of it. He was to convince Horus, most beloved of the Emperor to turn to the Chaos powers.
Erebus was charged with this, he went to the Davin system where Horus had just recovered and with his great convincing words coupled with the visions Horus had seen in his coma, Horus decided to turn. Erebus remained by Horus' side as a personal consellor. Not much is known of what Lorgar did next, he shows up on Isstvan V as part of the loyalist second wave to attack Horus' fortress. Alongside the Night Lords, Alpha Legion and Iron Warriors the loyalists of the Salamanders, Raven Guard and Iron Hands are massacred.
Lorgar was then tasked by Horus to send the majority of his legion and fleet to the planet Calth to try and kill Roboute Guillimann and prevent the Ultramarines from getting to Terra. Lorgar himself takes the rest of the legion to Terra alongside the other traitor legions.
After the defeat of Horus by the Emperor Lorgar flees to the Eye of Terror and makes his home in the Basillica of Torments, he is made a Daemon prince and has never been seen again.
