The earliest date given for a Viking raid of Britain is 789 when, according to the "Anglo-Saxon Chronicle", Portland was attacked. A more exact report dates from 8 June 793, when the cloister at Lindisfarne was pillaged by foreign seafarers. These raiders, whose expeditions extended well into the 9th century, were gradually followed by armies and settlers who brought a new culture and tradition markedly different from that of the prevalent Anglo-Saxon society of southern Britain. The Danelaw, established through the Viking conquest of large parts of the Anglo-Saxon cultural sphere, was formed as a result of the Treaty of Wedmore in the late 9th century, after Alfred the Great had defeated the Viking Guthrum at the Battle of Ethandun. Between 1016 and 1042 England was ruled by Danish kings. Following this, the Anglo-Saxons regained control until 1066.