At some point in his life, Makepeace was tried for manslaughter but found innocent.
Makepeace fell in love with the witch Yelena Pazhets and the couple had a son. When the boy was too old to remain with the witches, Makepeace took custody of him. He raised his son to believe in the things which Lord Asriel was fighting for. His son died in the war for the Republic of Heaven, shot through the heart by his own mother.
Feeling that Makepeace was to blame due to the way he raised their son, Pazhets attempted to drug her ex-lover in order to frame him for the murder of Lyra Silvertongue. She died and both Makepeace and Silvertongue survived unscathed.
Sebastian Makepeace was described as a man in his sixties, with a dazed and ravaged face. He also had scarred and sooty hands.
- Lyra's Oxford (First appearance)