From A Wiki of Ice and Fire
Nightsong is the seat of House Caron. The formidable castle is located in the Dornish Marches in the southwestern stormlands, north of the Prince's Pass and the Red Mountains. The castle is known for its Singing Towers.
Maester Yandel states the Carons have held Nightsong for many centuries and the castle guarded the western border of the domain of the Storm Kings of House Durrandon, but also that the Kingdom of the Reach once included western marches from Horn Hill to Nightsong. Records indicate the castle has been besieged at least 37 times in the last millenium. Nightsong was burned by Lord Fowler during the First Dornish War.
A Clash of Kings
During the Battle of the Blackwater, Ser Philip Foote kills Lord Bryce Caron, ending House Caron. The Iron Throne awards Nightsong to Philip after the battle, forming House Foote of Nightsong.
A Dance with Dragons
The Bastard of Nightsong, the late Bryce Caron's half-brother Rolland Storm, is the pretender Lord of Nightsong.
References and Notes