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Just what is Richard III’s DNA telling us….?

DNA - family tree

The following link arrived in my box this morning.…/Richard_III_The_Livingstons_…/4764886 I quote:

“18.03.2017, 07:26 by John Smith

“A skeleton excavated at the presumed site of the Grey Friars friary in Leicester in 2012 is almost certainly that of the English king, Richard III (1452 -1485), and mtDNA (which is passed from mother to child) extracted from the skeleton matches mtDNA taken from descendants of Richard’s sister Anne of York. However Y-DNA (which is passed from father to son) extracted from the skeleton apparently doesn’t match Y-DNA taken from descendants of Henry Somerset the 5th Duke Of Beaufort, who according to history descended from Richard’s 2nd great grandfather Edward III (1312 – 1377).

“The implication according to geneticists, and the media, is that there is a ‘false paternity event’ somewhere between Edward and the Somersets. Also, the false paternity events don’t end there, for only 4 of these 5 Somerset descendants match each other. And it may be worse even than this: the patrilineal line of a Frenchman named Patrice de Warren apparently traces back to Richard III through the illegitimate son of Edward III’s 4th great grandfather, Geoffrey Plantagenet, Count of Anjou (1113 – 1151).

“But de Warren’s Y-DNA doesn’t match that of either Richard III or any of the Somersets. In this note, a formula for calculating the time of the most recent common ancestor is introduced, and some of its consequences outlined. This formula arises from a mathematical framework within which it is possible that the traditional genealogy is correct, and that Geoffrey Plantagenet was the father of a male line incorporating Richard III, all 5 Somersets, and Patrice de Warren.”

References: Maclea.htm

Me again: The above prompted me to look back at some of the articles that abounded in 2015, when discussion about Richard’s DNA was rife. I selected the following, if only because of the eye-catching family tree:-…/01/03/king-richard-iii-dna/

As the saying goes, the thot plickens. Just who is the father of who…? Our posts here and here may well have answered this.


Richard III, snooker and probability

One thing of which we can be certain is that Richard III never played snooker. It was not invesnookernted until 1875 in Jabalpur by a Colonel Chamberlain (1). Nevertheless, it is an excellent vehicle for demonstrating the laws of probability with particular reference to the descent of the Plantagenet Y-chromosome from Edward III.

Imagine that you have walked into a snooker club where a member lends you four white balls and fifteen reds, the white balls obviously from more than one set, but in a drawstring bag. The cue balls represent the paternal links from Edward III to Richard III and the reds represent the descent from Edward III to Henry, 5th Duke of Beaufort (2). We already know that the 5th Duke’s living putative descendants have a different Y-haplogroup to Richard III, indicating that there is at least one “false paternity event” in one or both lines, but “Somerset 3” has a different Y-chromosome to his putative cousins, showing that another such has occurred at some time since 1760.

The bag is now held towards you and you are invited to insert your hand and withdraw a ball but you cannot discern its colour until you are holding it outside the bag – we are assuming randomness a priori. The probability of one random ball being red is 15/19 or approximately 79%. If you withdrew two balls, the probability of both being red is 15×14/19×18 or about 61%. The probability of three balls all being red is 15x14x13/19x18x17 or about 47%.

The probability of any paternal link in these chains being false is the same as stated above. We only know that there is one such event and it is 79% likely to have been in the descent to the 5th Duke but 21% to Richard. We cannot yet assume there to be more than one broken link in either chain and it would take three “milkmen” for the red ball (Beaufort) probability to fall below 50% and for a York false paternity event to be probable.



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