From A Wiki of Ice and Fire
|Book(s)|| A Storm of Swords (mentioned)|
A Feast for Crows (appendix)
A Storm of Swords
Carellen's mother, Ravella Swann, tells Arya Stark that Carellen had been sent to Oldtown at the start of the War of the Five Kings, to stay with Ravella's great-aunt, a septa at one of the city's motherhouses.