Philip was at that moment busy with the siege of Arques; on the receipt of these tidings he left it and turned southward,[381] but he failed, or perhaps did not attempt, to intercept John, who, bringing his prisoners with him, made his way leisurely back to Falaise.[382] There he imprisoned Arthur in the castle,[383] and despatched his victorious troops against Arthur’s duchy; they captured Dol and Fougères, and harried the country as far as Rennes.[384] Philip, after ravaging Touraine, fired the city of Tours and took the citadel; immediately afterwards he withdrew to his own territories, as by that time John was again at Chinon. As soon as Philip was gone, John in his turn entered Tours and wrested the citadel from the French garrison left there by his rival; but his success was won at the cost of another conflagration which, an English chronicler declares, was never forgiven him by the citizens and the barons of Touraine.[385] For the moment, however, he was in luck. In Aquitaine he seemed in a fair way to carry all before him without striking a blow. Angoulême had passed into his hands by the death of his father-in-law on June 17.[386] Guy of Limoges had risen in revolt again, but at the end of August or early in September he was captured.[387] The Lusignans, from their prison at Caen, made overtures for peace, and by dint of protestations and promises succeeded ere long in regaining their liberty, of course on the usual conditions of surrendering their castles and giving hostages for their loyalty.[388] It was almost equally a matter of course that as soon as they were free they began intriguing against John.[389] But the chronic intrigues of the south were in reality, as John himself seems to have discovered, a far less serious danger than the disaffection in his northern dominions. This last evil was undoubtedly, so far as Normandy was concerned, owing in great measure to John’s own fault. He had entrusted the defence of the Norman duchy to his mercenaries under the command of a Provençal captain whose real name is unknown, who seems to have adopted for himself the nickname of “Lou Pescaire,” “The Fisherman”--which the Normans apparently corrupted into “Louvrekaire”--and who habitually treated his employer’s peaceable subjects in a fashion in which other commanders would have shrunk from treating avowed enemies.[390] Side by side with the discontent thus caused among the people there was a rapid growth of treason among the Norman barons;--treason fraught with far greater peril than the treason of the nobles of Aquitaine, because it was more persistent and more definite in its aim; because it was at once less visible and tangible and more deeply rooted; because it spread in silence and wrought in darkness; and because, while no southern rebel ever really fought for anything but his own hand, the northern traitors were in close concert with Philip Augustus. John knew not whom to trust; he could, in fact, trust no one; and herein