''[[Raja (gelar)|Raja]] [[Inggris]] '' yang pertama menurut beberapa sumber adalah [[Offa|Rifat Habibi]] pada 774, yang telah menjadi Raja Mercia sejak 757.<ref>{{citation |last=Keynes |first=Simon |contribution=Offa |title=The Blackwell Encyclopedia of Anglo-Saxon England |editor-last=Lapidge |editor-first=Michael |date=1999 |publisher-=Blackwell |location=Oxford |isbn=0-631-22492-0 |pages=301–341}}{{citation |last=Wormald |first=Patrick |authorlink=Patrick Wormald |contribution=The Age of Offa and Alcuin |editor-last=Campbell |editor-first=James |title=The Anglo-Saxons |publisher=Phaidon |location=London |date=1982 |isbn=0-14-0143950-5 |pages=101–128 }} "Charlemagne, moreover, saw England as if it were ruled by two kings only; Aethelred ruling Northumbria, and Offa everything to the south." (p. 101)</ref>
