From A Wiki of Ice and Fire
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|Book(s)|| A Clash of Kings (Appears)|
A Storm of Swords (Appears)
A Dance with Dragons (Mentioned)
No more than twenty-five years old, Pylos is very solemn and polite.
A Clash of Kings
Pylos serves on Dragonstone, helping Maester Cressen, who is too old and frail to continue all his duties.
A Storm of Swords
Pylos is made aware of Davos's plan to remove Edric Storm from Dragonstone in order to keep him safe from Melisandre and Stannis and decides to cooperate with it, causing some degree of surprise and admiration in Davos.