From A Wiki of Ice and Fire
|Alias||Ulmer of the Kingswood|
|Allegiance|| Kingswood Brotherhood|
|Book(s)|| A Storm of Swords (Appears)|
A Feast for Crows (Mentioned)
A Dance with Dragons (Appears)
He was once an outlaw and member of the Kingswood Brotherhood. While a member of the Brotherhood, according to Ulmer he once put an arrow through the hand of Lord Commander Gerold Hightower, the White Bull, in order to steal a kiss from a Dornish princess - most likely Elia Martell. He also stole her jewels and a chest of coins.  Ulmer helped Wenda the White Fawn burn her mark in the buttocks of her highborn captives.  After the destruction of the Brotherhood, he was sent to the Wall, and is presumably the last survivor of the disbanded organization.
A Storm of Swords
Ulmer is part of the force that left Castle Black and the Shadow Tower in search of Benjen Stark and Mance Rayder. He survives the Battle of the Fist of the First Men and is among the men who made it back to Craster's Keep. He is one of the few survivors who made it all the way back to Castle Black.
After the election of Jon Snow as the new Lord Commander of the Night's Watch Ulmer bends his knee for Jon. Jon later orders that the entire garrison has to practice using the bow under the guidance of Ulmer.
A Dance with Dragons
While discussing his archery practice under Ulmer's guidance Samwell Tarly mentions to Jon Snow that he likes Ulmer's stories and that someone needs to write them down and put them in a book. Jon says that Sam will do it, there is parchment and ink at the Citadel, as well as longbows.