A young, prodigiously skilled longbowmen from the Marches, Anguy wins the archery contest during the Hand’s tourney but fritters away the riches until he’s left with nothing but to join Lord Beric Dondarrion‘s expedition against the Mountain that Rides.
The archery contest and the fact that it’s won by a Marcher longbowmen is noted in the first novel, A Game of Thrones, but does not appear on the show.
Anguy is among the brotherhood without banners who come across Arya, Gendry, and Hot Pie, taking them to Lord Beric.