This sounds way complicated. Portuguese History is much simpler. Everybody knows who the first king was. I'm thoroughly baffled by the set of comments and it sounds like a tricky question to ask at breakfast time...
The problem here is really about how you define "England". Early kings were arguably kings of just bits of England - for eaxmple, some were just a / the leading king among several Anglo-Saxon kings; others shared the kingdom with the Danes / vikings.
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