Prison guard who doesn't get along with Cacofonix too well
It's a well-known fact: there is no escaping from the jails of the Circus Maximus in Rome. However, if you are an indomitable Gaul, you can drive the guards of this model prison crazy.
Take a look at Appianglorious, the zealous Legionary. Obelix's habit of breaking down doors instead of opening them sets his nerves on edge! It's true that I wouldn't want to be a building super with Obelix in the neighborhood. And then there's Sendervictorius, his buddy in charge of watching over Cacofonix, who goes out of his mind with each new refrain the bard sings.
So that's how it took only three Gauls to bring pandemonium to this ancient Alcatraz - what a circus!
In which book ?
4 - Asterix the Gladiator