I recently read of a project that had concluded that most of the US Presidents descend from King John.I purchased a copy of the chart. Very interesting.
Eight hundred years ago there existed a population within 200 miles of a triangle drawn between Copenhagen, London and Paris.
Those individuals that were part of the population are today ancestors to SOME or MOST of the Americans alive between 1700 and 2000.
I need the input from mathematician and statistician--would it not be a correct assumption that if the person from 800 years ago had any descendants alive after 1700, he would have thousands of such descendants?
Therefore, it is not so uncommon to discover that a great portion of a population shares a pedigree back to the same community 800 years ago?
And, when you consider that Japan had a royal family going back twice as far, would you not conclude that nearly 90 % of the Japanese population was some type of cousin to royal family?