Vikings' season 5B: Is Magnus really the son of Ragnar Lothbrok?

There isn't any proof Magnus is the son of Ragnar Lothbrok and a quick look up of historical facts reveals there was no Magnus in Ragnar's nor Queen Kwenthrith's legacy

Sweatpants & TV Vikings, Season 5, Episode 15: “Hell”

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No Spoilers] The Sons of Ragnar Lothbrok. : r/vikingstv

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Vikings spoilers: Magnus 'confirmed' as Ragnar Lothbrok's son as