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## What the Y-Chromosome Did Not Prove
The Y-chromosome mismatch attracted considerable public attention, particularly in reporting that framed it as suggesting the Plantagenet dynasty had not been what its name claimed, or that the current British royal family’s legitimacy was brought into question. These framings require careful examination.
The mismatch establishes that there was at least one false paternity event somewhere in a chain of nineteen or more generations. It does not identify which generation. It does not identify which woman was involved. It does not specify whether the break occurred before Richard III, after him, or both. The chain runs from Edward III, who died in 1377, through multiple documented generations to the Somerset comparators in the present day. A break anywhere in that chain would produce the observed result.
The implications for “legitimacy” of any political dynasty depend on where the break occurred, and the evidence does not establish that. If the break occurred after Richard’s own lifetime — which is entirely possible, given the length of the chain — it has no bearing whatsoever on Richard III’s parentage or on his claim to the throne as he himself would have understood it. If it occurred before his birth, it raises questions about whether Richard was actually a descendant of Edward III in the biological sense — but again, such questions are historically interesting rather than politically actionable in the twenty-first century.
Turi King and her colleagues were careful in their published findings to avoid sensational claims about the implications of the Y-chromosome result. They noted the mismatch, offered a statistical context for how common such events are across many generations, and declined to speculate about which generation the break had occurred in or who had been responsible. These are the appropriate limits of what the data can say.