Sort of depends how you define it, doesn't it? I mean, there's Egbert, the king of Wessex whose lordship over the Saxons led to the development of an English crown. There's Alfred the Great, of course. Then there's Athelstan, "Rex Totius Brittannae," the first man to be crowned King of the English. Etc....
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ETA: And what an appropriate icon you have used :-)
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(My officemate in grad school had a flow chart of British leaders running along half of our wall, so I think I gained some knowledge by pure osmosis.)