From A Wiki of Ice and Fire
|Allegiance|| House Grey|
|Book(s)|| The World of Ice & Fire (mentioned)|
The Princess and the Queen (mentioned)
Ser Garibald led a group of rivermen in the battle by the Lakeshore. Garibald refused the challenge of Ser Criston the Kingmaker during the Butcher's Ball, and Criston was instead slain by arrows.