Haakon Sigurdsson was a real historical figure. He was the ruler of Norway from 975 to 995, and he was most certainly Nordic. However, in the Netflix series Vikings: Valhalla, Haakon Sigurdsson has been turned into a black woman. This is as ludicrous as Chris Hemsworth portraying a Zulu king in a show about African warriors.

The original Vikings series came out in 2013 and many White people latched onto it, as it was a show featuring a White cast, portraying White culture. As many of us know, the version Norsemen shown in Vikings was not historically accurate and actually made White people look bad, but still it was something of a breath of fresh air for the average White person, who was drowning in a semitic sea of mulitcultural media. The original Vikings series would eventually throw in a little diversity, with Ragnar race-mixing with an Asian slave before eventually killing her for getting him hooked on drugs, but still it seemed historically plausible.

The original History Channel show had lots of fans, so of course when the show came to an end, it needed to be rebooted, this time on Netflix. The new Vikings: Valhalla show takes place some time after the events of the original series, and involves Leif Erikson and other notable figures from our real history. This show, however, has no regard for actual history when casting its characters, with black vikings becoming a thing.
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Yes, vikings went around the world, and we can find DNA evidence of that. What he have zero evidence of, however, is that they were a multiracial group, with black queens ruling over them in their homelands.

I think we have a pretty good idea what vikings looked like, as we can see still find their descendants in the Nordic countries, where their culture is being displaced and their people being genocided by the mass invasion of brown and black migrants.