Gaul was divided into three parts. No, four parts — for one small village of indomitable Gauls still held out against the Roman invaders. BOOK 20 Asterix and Obelix meet a Corsican chieftain who has been taken prisoner and accompany their new friend Boney was a warrior way a yix back to Corsica to help him foil the evil designs of the corrupt Roman Praetor Perfidius.