Is it true that Thomas Jefferson was a descendent of Charlemagne and that they had Phoenician blood?

look at it this way: the phoenicians were trading 2,500 years ago, settling from their native Lebanon all the way to southern France. The chances that some people will be distantly related to them (as a widespread, multicultural civilisation) are good; Genghis Khan fathered so many children and had such a huge empire that about 1% of the world's population can trace their genes to him. As long as the particular genes you're discussing are dominant you might as well say you're descended from the phoenicians too. We're also talking very small details, whihc encomp much of the population; it's like the measure "9th cousin" is a measure so small that any two given individuals are likely to be 9th cousins.