Ten years prior to the events of the film, Quartus was murdered by his elder brother Secundus. Secundus told his brother he had a sore foot, and requested Quartus fetch him ice for it. Quartus obliged, and Secundus locked him in the cold store; causing him to freeze to death. His body is covered with a thin layer of frost. He is sarcastic in a way but serious depending on the situation. When Secundus was murdered by his brother Septimus - with aid from his father - at their father's deathbed, Quartus took the opportunity to taunt his dead brother. Once Tristan Thorne became the next King of Stormhold, Quartus passed on to the afterlife with his brothers.
- Quartus is thought to have died some time after Quintus, as Quintus mistakenly believed his elder brother had murdered him, when Septimus had been responsible. This could also suggest that Sextus died after Quartus, as his ghost would likely have witnessed Septimus' attack on Quintus, and been able to tell his brother what really happened.