In 1066 and All That (1930), a parody book of English history, Cnut is described as a "bad king," who "became a good king." While this is a simplistic overview, it captures the essence of the portrait...
(King in what would later be England, commanded the sea to stop rising. It didn't. There's an explanation, involving rebuking flatterers in his Court, which I don't think the index subject is prone to)
I was listening to an episode of #InnOurTimes about Knútur (#Cnut) and Dr Erin Goeres made me very happy by pronouncing the #OldNorse names with the trailing -r. Not Harald but Haraldr (or even Haraldur).