Ernesto "Redbeard" Barbarossa is the antagonist in The Thief Lord and a sneaky shopkeeper.
He is a very rude man and is often very selfish. He is often trying to give the children as little as possible.
He has a red beard hence the name redbeard, but Riccio and Prosper find out later that he dyes it. At the end goes to age 7 from pg. 57.