programme of vernacular literacy in England, which was unprecedented. This began a growth in charters, law, theology and learning. Alfred thus laid the foundation for the great accomplishments of the tenth century and did much to make the vernacular more important than Latin in Anglo-Saxon culture. Late Anglo-Saxon history (899–1066) A framework for the momentous events of the 10th and 11th centuries is provided by the Anglo-Saxon Chronicle. However charters, law-codes and coins supply detailed information on various aspects of royal government, and the surviving works of Anglo-Latin and vernacular literature, as well as the numerous manuscripts written in the 10th century, testify in their different ways to the vitality of ecclesiastical culture. Yet as Keynes suggests "it does not follow that the 10th century is better understood than more sparsely documented periods". Reform and formation of England (899–978) During the course of the 10th century, the West Saxon kings extended their power first over Mercia, then into the southern Danelaw, and finally over Northumbria, thereby imposing a semblance of political unity on peoples, who nonetheless would remain conscious of their respective customs and their separate pasts. The prestige, and indeed the pretensions, of the monarchy increased, the institutions of government strengthened, and kings and their agents sought in various ways to establish social order. This process started with Edward the Elder – who with his sister, Æthelflæd, Lady of the Mercians, initially, charters reveal, encouraged people to purchase estates from the Danes, thereby to reassert some degree of English influence in territory which had fallen under Danish control. David Dumville suggests that Edward may have extended this policy by rewarding his supporters with grants of land in the territories newly conquered from the Danes and that any charters issued in respect of such grants have not survived. When Athelflæd died, Mercia was absorbed by Wessex. From that point on there was no contest for the throne, so the house of Wessex became the ruling house of England. Edward the Elder was succeeded by his son Æthelstan, who Keynes calls the "towering figure in the landscape of the tenth century". His victory over a coalition of his enemies – Constantine, King of the Scots; Owain ap Dyfnwal, King of the Cumbrians; and Olaf Guthfrithson, King of Dublin – at the battle of Brunanburh, celebrated by a poem in the Anglo-Saxon Chronicle, opened the way for him to be hailed as