The tower is lopsided beneath the weight of slagged stone, the result of dragonfire. There is an arching stone bridge that connects it to the Widow's Tower. The castellan's chambers are within this tower, and are as spacious as any lords.
The lord's bedchamber contains a hearth and a featherbad. Half a flight of stairs below is the solar, a spare, drafty room that is as large as a hall in a smaller castle. The solar contains a huge oaken table.
The original name for the tower is unknown, and it received its new name after the burning of Harrenhal during Aegon's Conquest. King Harren the Black and his sons burned alive in the tower when King Aegon I Targaryen had his dragon, Balerion, attack the castle with dragonflame.
Prince Daemon Targaryen led the assault on Harrenhal at the start of the Dance of the Dragons. The castellan of Harrenhal, the elderly Ser Simon Strong, was quick to strike his banners when the prince lighted atop Kingspyre on Caraxes. Later in the war, Alys Rivers watched the Battle Above the Gods Eye between Caraxes and Vhagar from the top of Kingspyre Tower. When the two dragons crashed into the Gods Eye, a gout of water as tall as Kingspyre is said to have splashed up.
A Clash of Kings
Lord Roose Bolton takes up residence in Kingspyre after the fall of Harrenhal to northmen, and he leeches himself in the lord's bedchamber. After bringing Lord Bolton his supper, Arya observes him throw a book into a hearth. That night, Arya sneaks through a narrow cellar window during her escape from Harrenhal, and she steals a dagger and a sheepskin map of the Trident from Roose's table.
If there were ghosts in Harrenhal, they never troubled her. It was the living men she feared, Weese and Ser Gregor Clegane and Lord Tywin Lannister himself, who kept his apartments in Kingspyre Tower, still the tallest and mightiest of all, though lopsided beneath the weight of the slagged stone that made it look like some giant half-melted black candle.—thoughts of Arya Stark