Herondale), hoping to create a stronger warrior, without the side effects Jonathan suffered from the use Demon blood. In the end, Valentine trained Jace, but was forced to abandon him when he was 10 years old, making Valentine the only father Jace has known. It is also thought that of the two boys, the angel and the demon, that Valentine loved Jace more than his own son. Valentine's Love Interests Jocelyn Fairchild/Fray/Morgenstern/Graymark/Garroway: Lucian Graymark: When Valentine and Lucian (Luke) were once parabatai, they shared a brotherly love. Though no longer parabatai, they hate each other to the ends of the earth. Appearances in books City of Bones City of Ashes City of Glass City of Lost Souls City of Fallen Angels (mentioned) City of Heavenly Fire (mentioned) A History of Notable Shadowhunters & Denizens of the Downworld Jonathan Morgenstern Sebastian Verlac/Jonathan Christopher Morgenstern/Sebastian Morgenstern is the son of Valentine Morgenstern and Jocelyn Fairchild, and brother of Clary Fray. His real name is Jonathan Christopher Morgenstern, but he went by Sebastian Verlac (cousin of the Penhallows) in City of Glass. He is very sadistic in nature, as a result of having been experimented on with the blood of the Greater Demon Lilith, which robbed him of his humanity. He first appears in City of Glass as Sebastian Verlac, charming his way into the lives of the Lightwoods. He takes Clary to see Ragnor Fell, and kisses her, disgusting her. Upon Clary's return with Jace to Alicante, it is discovered that Max Lightwood had seen someone climbing the demon warding towers. Sebastian was the person climbing the towers, and it was his blood that was used to bring down the wards. During the first attack on Alicante, he also kills Max Lightwood and severely injures Isabelle Lightwood. He is eventually tracked down and killed by Jace, before the summoning of Raziel by Valentine, but his body is never recovered. He is taken by his "mother", Lilith, and taken to safety. She uses Jace as leverage and tries to bring him back from the dead. In City of Fallen Angels he is awoken, and uses a rune put on Jace to control him. He becomes the main antagonist in City of Lost Souls, using Lilith's bond to alter Jace's memories to believe they are on the same side and plans on raising and army of demons and Dark Shadowhunters to destroy the world.