Rupert Blackthorn was the husband of Tatiana Lightwood.
After coming home from their honeymoon, Rupert and Tatiana decided to pay a call to his wife's family home in Cheswick. The demonic worm that Benedict Lightwood had become seized him from his family's carriage, leaving a frightened Tatiana inside. He was seemingly eaten or otherwise ripped apart and killed by the demon, as his severed foot was later found in the bushes.
- Clockwork Prince (first mention)
- Clockwork Princess (first mention by name; first and only physical appearance as a corpse)
- The Midnight Heir (mentioned only)
- Chain of Gold (mentioned only)
- Chain of Iron (mentioned only)
- Lady Midnight (mentioned only)
- Secrets of Blackthorn Hall (mentioned only)
- His body was taken away by the Clave at 8:40. In her madness, Tatiana stopped every clock in both her homes to this time as a way to commemorate when "her world had ended."