From A Wiki of Ice and Fire
|Died||In 299 AC, Castle Black|
A Storm of Swords (appears)|
A Feast for Crows (appendix)
A Storm of Swords
Lenn is one of the raiders who is ordered by Mance Rayder to climb the Wall and attack Castle Black from the south. He survives the climb and arrives at Queenscrown with the others. Lenn dies during the attack on Castle Black.