Who was the first king of England?
History of England
Æthelstan continued the expansion of his father and aunt and was the first king to achieve direct rulership of what we would now consider England. The titles attributed to him in charters and on coins suggest a still more widespread dominance. His expansion aroused ill-feeling among the other kingdoms of Britain, and he defeated a combined Scottish-Viking army at the Battle of Brunanburh. However, the unification of England was not a certainty. Under Æthelstan's successors Edmund and Eadred the English kings repeatedly lost and regained control of Northumbria. Nevertheless, Edgar, who ruled the same expanse as Athelstan, consolidated the kingdom, which remained united thereafter.
Monarchy of the United Kingdom
Following Viking raids and settlement in the ninth century, the Anglo-Saxon kingdom of Wessex emerged as the dominant English kingdom. Alfred the Great secured Wessex, achieved dominance over western Mercia, and assumed the title "King of the English". His grandson Æthelstan was the first king to rule over a unitary kingdom roughly corresponding to the present borders of England, though its constituent parts retained strong regional identities. The 11th century saw England become more stable, despite a number of wars with the Danes, which resulted in a Danish monarchy for one generation. The conquest of England in 1066 by William, Duke of Normandy, was crucial in terms of both political and social change. The new monarch continued the centralisation of power begun in the Anglo-Saxon period, while the Feudal System continued to develop.