I was reminded today of the myth that a certain African tribe (the Dogon) were privy to special astronomical knowledge that could only have been conveyed to them by aliens. The best debunk I’ve seen of this is on a site that I wouldn’t necessarily expect to find it on – well done to the author. Absolutely nothing I could add. There’s also a summary and a letters page of sorts on Skepdic.
The tl;dr is that it’s likely that the Dogon had taken on board new information about the star in question (Sirius) from prior western visitors. Rather than aliens.