From A Wiki of Ice and Fire
The Moon Brothers are one of the Vale mountain clans of the Mountains of the Moon. They have close ties with the Black Ears.
A Game of Thrones
Lharys claims it was either members of the Milk Snakes or the Moon Brothers that were the first to descend upon Catelyn Stark's party in the Mountains of the Moon.
The Moon Brothers are among the clans that join Tyrion Lannister on the promise of weapons and armor. The party with Tyrion is led by Ulf, the son of Umar.
A Clash of Kings
In preparation for Stannis Baratheon's arrival before the gates of King's Landing, Tyrion sends the Black Ears and the Moon Brothers into the kingswood to harass and harry Stannis's army on its march to King's Landing before the Battle of the Blackwater.
- ↑ A Game of Thrones, Chapter 31, Tyrion IV.
- ↑ A Game of Thrones, Chapter 56, Tyrion VII.
- ↑ A Clash of Kings, Chapter 49, Tyrion XI.