The Heptarchy in the context of "Monarch of England"

This list of kings and reigning queens of the Kingdom of England begins with Alfred the Great, who initially ruled Wessex, one of the seven Anglo-Saxon kingdoms which later made up modern England. Alfred styled himself king of the Anglo-Saxons from about 886, and while he was not the first king to claim to rule all of the English, his rule represents the start of the first unbroken line of kings to rule the whole of England, the House of Wessex.

Arguments are made for a few different kings thought to have controlled enough Anglo-Saxon kingdoms to be deemed the first king of England. For example, Offa of Mercia and Egbert of Wessex are sometimes described as kings of England by popular writers, but it is no longer the majority view of historians that their wide dominions were part of a process leading to a unified England. The historian Simon Keynes states, for example, "Offa was driven by a lust for power, not a vision of English unity; and what he left was a reputation, not a legacy." That refers to a period in the late 8th century, when Offa achieved a dominance over many of the kingdoms of southern England, but it did not survive his death in 796. Likewise, in 829 Egbert of Wessex conquered Mercia, but he soon lost control of it.