Kayce is the seat of House Kenning of Kayce in the westerlands. The castle and town are located on a peninsula south of Fair Isle and west of Casterly Rock. Feastfires is located nearby to the southwest.
Kayce was controlled by the ironborn during the era of the driftwood kings. The town was freed when Herrock the Whoreson used his horn to signal the whores of the town to open a postern gate, allowing Herrock's men to enter the town. The region was then part of the dominion of the Kings of the Rock from House Lannister.
According to Maester Yandel, Lord Dalton Greyjoy led his reavers in taking Kayce during the Dance of the Dragons. The widow of the Knight of Kayce was taken by Dalton as a salt wife. According to Archmaester Gyldayn, Lady Johanna Lannister was focused on defending Kayce instead of involving the westerlands further in House Targaryen's civil war. Leading a host from Casterly Rock and Lannisport, Johanna routed the ironborn beneath Kayce's walls, with Dalton's uncle slain in the battle. Songs claim Johanna slew twelve ironmen in the fighting. When Lord Alyn Velaryon sailed to confront Dalton, ironborn longships gathered along the Sunset Sea, including Kayce. Dalton was assassinated at Faircastle before Alyn arrived in the west, however.
- A Storm of Swords, Appendix.
- George R. R. Martin's A World of Ice and Fire, Kayce.
- A Song of Ice and Fire Campaign Guide
- A Dance with Dragons, Map of the South
- The Lands of Ice and Fire, Westeros.
- The World of Ice & Fire, Driftwood Crowns.
- Fire & Blood, Jaehaerys and Alysanne - Their Triumphs and Tragedies.
- The World of Ice & Fire, The Iron Islands: The Red Kraken.
- Fire & Blood, Under the Regents - The Voyage of Alyn Oakenfist.
- Fire & Blood, Aftermath - The Hour of the Wolf.
- Fire & Blood, Under the Regents - The Hooded Hand.
- The World of Ice & Fire, The Westerlands: House Lannister Under the Dragons.