From A Wiki of Ice and Fire
|Alias||Garin of the Orphans|
|Book(s)||A Feast for Crows (Appears)|
He is the milk-brother and close personal friend of Arianne Martell.
A Feast for Crows
Garin joined Princess Arianne Martell's attempt to name Princess Myrcella Baratheon Queen of Westeros. While traveling they were intercepted by Areo Hotah. Garin was captured with most of his co-conspirators.
After his capture, he is sent to Ghaston Grey to await his sentence by Prince Doran Martell. As punishment, he is to spend the next two years in Tyrosh while Prince Doran demands hostages and coin from the other orphans of the Greenblood.