In the year of our Lord's incarnation 876, being the twenty-eighth year of king Alfred's life, the aforesaid army of the pagans, leaving Grantabridge by night, entered a castle called Wareham, where there is a monasterium of holy virgins between the two rivers Fraun[105] and Trent, in the district which is called in British _Durngueis_, but in Saxon _Thornsæta_, placed in a most secure situation, except that it was exposed to danger on the western side from the nature of the ground. With this army Alfred made a solemn treaty, to the effect that they should depart out of the kingdom, and for this they made no hesitation to give as many hostages as he named; also they swore an oath over the Christian relics,[106] which with king Alfred were next in veneration after the Deity himself, that they would depart speedily from the kingdom. But they again practised their usual treachery, and caring nothing for the hostages or their oaths, they broke the treaty, and sallying forth by night, slew all the horsemen that the king had round him, and turning off into Devon, to another place called in Saxon _Exanceaster_,[107] but in British _Caer-wisc_, which means in Latin, the city of Ex, situated on the eastern bank of the river Wisc, they directed their course suddenly towards the south sea, which divides Britain and Gaul, and there passed the winter. In the same year, Halfdene, king of those parts, divided out the whole country of Northumberland between himself and his men, and settled there with his army. In the same year, Rollo with his followers penetrated into Normandy. This same Rollo, duke of the Normans, whilst wintering in Old Britain, or England, at the head of his troops, enjoyed one night a vision revealing to him the future. See more of this Rollo in the Annals.[108]