Researchers from Yale and the University of Pisa say modern DNA testing has helped answer a centuries-old question about two brothers from the Medici dynasty. Historians had long debated whether the pair died from natural illness or were the victims of murder.

According to the report, scientists examined DNA taken from the brothers’ skeletal remains and looked for evidence that could point to foul play. The work brought together genetic analysis and paleopathology, using scientific methods to revisit a case that had remained unresolved for nearly 500 years.

The findings give historians a new way to assess one of the most famous family mysteries in European history. Rather than relying only on old records and long-running theories, the researchers used biological evidence preserved in the remains to test what may have happened.

The study highlights how advances in DNA research are reshaping the investigation of historical deaths. In this case, the Medici debate has moved from speculation toward a clearer scientific explanation based on the brothers’ remains.