I have discovered that I am related to someone specific who lived in 1066. How likely is this? In other words, the answer could be “No big deal. When you go back that many generations,the math shows that you are X percent likely to be related to anyone, where X is large - say 50-90% - because you have so many ancestors and the population then was so small.” Or the answer could be “WOW, that’s significant. Because the likelihood of that is small, where X is low.” So maybe the general question is “What is the likelihood that Person A, living now, is related to Person B, living in 1066?” And to specify even more narrowly, let’s constrain to the European/ Scandinavian/ Finnish populations that existed then.