Alyn Ambrose is the son of Lord Arthur Ambrose and Lady Alysanne Hightower. He is described as being gangly.
A Clash of Kings
As a squire Alyn takes part in the Battle of the Blackwater. During the battle he kills a Myrish archer and a Mullendore man-at-arms.
A Storm of Swords
Following his feats of arms during the Battle of the Blackwater, Alyn is betrothed to Elinor Tyrell.
A Feast for Crows
Alyn accompanies Elinor Tyrell when Elinor goes with her cousin, Margaery Tyrell, for a ride.