From A Wiki of Ice and Fire
|Book||A Storm of Swords (mentioned)|
Aemon Costayne is a member of House Costayne and is a traveling singer.
A Storm of Swords
Symon Silver Tongue tells Tyrion Lannister that Aemon is one of the seven singers who is to perform at the wedding feast of King Joffrey I Baratheon and Queen Margaery Tyrell.
- ↑ 1.0 1.1 A Storm of Swords, Chapter 32, Tyrion IV.