|Full name:||Stephen William Herondale|
|Family:|| Celine Montclaire † (wife)|
Amatis Graymark (ex-wife)
Jace Lightwood (son)
Marcus Herondale (father)
Imogen Herondale (mother)
Stephen William Herondale was a Shadowhunter, who lived in Idris. He was a member of Valentine's Circle. He is the biological father of Jace and the son of Imogen and Marcus Herondale. He was also at one point married to Amatis Graymark, Luke's sister.
Stephen was born to Marcus and Imogen Herondale at the London Institute. His family eventually moved to Idris, where he first met Valentine. Stephen would eventually go on to join Valentine's group, The Circle.
At some point in time, Stephen married Amatis Graymark.
In 1989, Stephen was present during an altercation between the warlock Magnus Bane and the Whitelaw family and the Circle, which was holding a werewolf pack hostage. A fight broke out between the groups, resulting in a number of casualties, including the Whitelaws.
When Lucian Graymark, Stephen's brother-in-law, became a werewolf and Valentine needed a new second in command, Valentine chose Stephen and convinced him to divorce Amatis, the sister of Lucian, and marry Celine Herondale instead.
He was killed in the Circle's raid on a vampire nest. His mother, Imogen Herondale, accepted the position as Inquisitor to hunt down all those responsible for his death. His wife Celine was pregnant with their child when she apparently committed suicide when she heard of his death. Valentine, with the help of Hodge Starkweather, saved their unborn son from his mother's womb. Valentine then took the baby and raised him as his own, as he was the baby that Valentine had been experimenting on with angel's blood.
Before his death, he wrote a letter to his son, believing that Valentine would kill him.
Years later, Amatis told Jace that he looked exactly like Stephen, except for his eyes, which he got from Celine. She then gave him a box of Stephen's old things and letters.
- The Last Stand of the New York Institute (first appearance)
- City of Ashes (first mentioned)
- City of Glass (illusion/mentioned only)
- City of Fallen Angels (mentioned only)
- City of Lost Souls (mentioned only)