“Ethan Glover was Brandon’s squire,” Catelyn said. “He was the only one to survive. The others were Jeffory Mallister, Kyle Royce, and Elbert Arryn, Jon Arryn’s nephew and heir.” It was queer how she still remembered the names, after so many years. “Aerys accused them of treason and summoned their fathers to court to answer the charge, with the sons as hostages. When they came, he had them murdered without trial. Fathers and sons both.”
“There were trials. Of a sort. Lord Rickard demanded trial by combat, and the king granted the request. Stark armored himself as for battle, thinking to duel one of the Kingsguard. Me, perhaps. Instead they took him to the throne room and suspended him from the rafters while two of Aerys’s pyromancers kindled a blaze beneath him. The king told him that fire was the champion of House Targaryen. So all Lord Rickard needed to do to prove himself innocent of treason was… well , not burn.
“When the fire was blazing, Brandon was brought in. His hands were chained behind his back, and around his neck was a wet leathern cord attached to a device the king had brought from Tyrosh. His legs were left free, though, and his longsword was set down just beyond his reach.
“The pyromancers roasted Lord Rickard slowly, banking and fanning that fire carefully to get a nice even heat. His cloak caught first, and then his surcoat, and soon he wore nothing but metal and ashes. Next he would start to cook, Aerys promised… unless his son could free him. Brandon tried, but the more he struggled, the tighter the cord constricted around his throat. In the end he strangled himself.
(Catelyn - A Clash of Kings)