The first person to assume the title Rex Anglorum (King of the English) was Offa of Mercia, though his power did not survive him. In the 9th century the kings of Wessex, who conquered Kent and Sussex from Mercia in 825, became increasingly dominant over the other kingdoms of England. The continuous list of English monarchs traditionally begins with Egbert of Wessex in 829. Alfred the Great and his son Edward the Elder used the title "King of the Anglo-Saxons." After Athelstan conquered Northumbia in 927, he adopted the title Rex Anglorum. Starting with Henry II (1154), the title became Rex Angliae (King of England).
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