father's will read to a meeting of the witan to prove his right to keep the whole of the property. Alfred rarely witnessed Æthelred's charters, and this together with the argument over their father's will suggests that they were not on good terms. The historian Pauline Stafford suggests that Æthelred chose to highlight his wife's status as queen in a charter in order to assert his own sons' claims to the succession. In 868, Æthelred issued a charter which was attested by a Mercian ætheling and himself attested a charter issued by his sister, Æthelswith, as queen of Mercia. Æthelred used several different titles in his charters. He is called by his father's usual title, Rex Occidentalium Saxonum (King of the West Saxons) in the charter of Ealhswith which he witnessed, and in five of his own. He is "King of the West Saxons and the Men of Kent" in two, and "King" and "King of the Saxons" in one each. The West Saxon charters of Æthelred and his elder brothers followed a uniform style, suggesting that they were produced by a single agency which operated over a number of years. The Viking invasions The character of Viking attacks on England decisively changed in the year that Æthelred succeeded to the throne. Previously the country had suffered from sporadic raids, but now it faced invasion aiming at conquest and settlement. A large force of Vikings, called by contemporaries the Great Heathen Army, arrived in East Anglia. King Edmund purchased peace by paying tribute and the Vikings stayed a year building up their strength. They then marched on York and conquered Northumbria, installing a puppet king. In late 867 they took Nottingham in Mercia and spent the winter there. Æthelred's brother-in-law, King Burgred, appealed to him for help. Æthelred and Alfred led a large West Saxon army to Nottingham and besieged the Vikings, but they refused to leave the safety of the town's defences. The combined Mercian and West Saxon armies were unable to breach the earth ramparts and ditch, and eventually Burgred bought them off. The Vikings then went back to York. In 869 the Vikings returned to East Anglia and conquered the kingdom, killing King Edmund. In December 870 they launched an attempt to conquer Wessex led by Kings Bagsecg and Halfdan. They occupied Reading on around 28 December. The town is between the Thames and Kennet rivers, and