It was revealed that he was actually the Biblical Lucifer of the Abrahamic religions, as the N'Garai told his daughter Satana when they were hunting her in revenge that, in prehistoric times, her father repelled their invasion of Earth as the head of Heaven's army.

In ancient times, the Sumerians worshipped Marduk as a god after seeing a previous battle his legions of Hell took part in on Earth.

In this guise he married one of the family members, a mortal woman named Victoria Wingate Hellstrom, and soon after moved to Lake Fire, Massachusetts.

While performing a ritual with Satana involving animal sacrifice, Victoria accidentally walked in and discovered Marduk's true nature.

Driven insane, Victoria spent the remainder of her life in an asylum where she kept a diary she meant to give to Daimon once he was old enough to understand.

Upon his 21st birthday Marduk invited his son to rule by his side, offering eternal life and power incarnate.

[8] Despite the continuing conflict he has with his children, it was revealed that Marduk still receives offerings of human souls from his daughter Satana.

[10] During the Fear Itself story line, Marduk attended the Devil's Advocacy, where the Hell-Lords talked about the Serpent's actions on Earth.

Marduk often brought his daughter gifts and eventually kidnapped her where they spent months together while he killed more victims before Ana finally escaped.