Shepherd
From A Wiki of Ice and Fire
The Shepherd was a crazed prophet who lived in King's Landing during the civil war.[1] He was a follower of the Faith.
Character & Appearance
He was one-handed and insane.
The Dance of Dragons
During the riots in King's Landing the Shepherd began to rant against dragons, not just the dragons that were coming to attack the city but all dragons everywhere. The half crazed crowd listened to him preach and after he was done ten thousands throats cried "Kill them! Kill them!" and much of the mob headed for the Dragonpit where the blacks dragons were dwelling.