>>12178969You have 2 parents, 4 grand parents, 8 great grand parents, 16 great great grand parents, then 32, 64, 128, etc. If you go like that for 30-40 generations you'd get a number billion times larger than the entire number of humans that have lived ever. Obviously, there weren't that many people in 8th century, so the solution is - inbreeding. I'm not talking about siblings or 1st cousins, rather 5th or 6th "cousins". Using the Occam's razor you can conclude that every person who was alive at that time on the same continent had to be one of your ancestors.
Also go the reverse way, Charlemagne had 19 children, each of his children had minimum 5, probably like 10, go just a few generations and again you get an insane number of people. He is the ancestor of every single noble house in Europe (that much can even be directly proven, by bloodlines). Chances of you not having a single ancestor who wasn't at least some lower Lithuanian nobility 1000 years ago are lower than 1%.
