Lorgar

Lorgar, also once called Lorgar Aurelian and the Urizen before the Horus Heresy, is a Daemon Prince of Chaos Undivided and the former Primarch of the Word Bearers Traitor Legion. Always determined to uplift Humanity through a deep belief in the divine, once the Emperor of Mankind rejected his attempts at worship, Lorgar discovered new Gods, the Ruinous Powers of the Gravemind, more worthy of his devotion during his infamous Pilgrimage. He was the first Primarch of the Legions to fall to the corruption of the Gravemind before the Horus Heresy and it was he who ordered the corruption of the Warmaster Horus. The remnants of his large Traitor Legion of Word Bearers Chaos  and himself can today be found on the Daemon World of Sicarus within the Eye of Terror.