From A Wiki of Ice and Fire
|Book(s)|| A Game of Thrones (Mentioned)|
A Clash of Kings (Mentioned)
A Feast for Crows (Appears)
Ser Alyn Stackspear is the second son of Lord Selmond Stackspear.
A Game of Thrones
Ser Alyn is one of the many knights in the Lannister host ravaging the Riverlands.
A Clash of Kings
A Feast for Crows