“In the winter of 1541 various members of the French Royal family would contract measles. Two prominent family members would die, and King Francis I would never see again.”
16th Century Europe: Everything That Happened by Irene Carter
“Francis III of Brittany, Dauphin of France, would pass away the second of January in 1542. His death would rock the Valois family: King Francis I was despondent (it was during his refusal to leave his son’s body that he would contract measles); the Dauphine was probably also despondent but due to the histrionics of the King was unable to take the time to grieve; and Prince Henry would take the opportunity to return to court.
Prince Henry would regret this for the rest of his days.”
Frances of France by Mariah Oliver
“While Prince Henry had survived the measles in his youth and was now immune, his wife and children were not. Upon their arrival at the French court, Princess Diane and their two children would fall victim to measles. Princess Diane’s health hadn’t been the best since the birth of their daughter three years earlier; she would pass away sometime late in February. Jean de Valois de Orleans, Henry and Diane’s eldest, would recover but suffer brain damage.”
Frances of France by Mariah Oliver
“…. Dowager Dauphine of France, her husband was dead, her father-in-law and brother-in-law seemed to be competing for who could grieve the most excessively, her mother-in-law was mostly ignoring her, and she was pregnant. (Thankfully Frances had contracted measles as a child and so was safe.)
With the King ill and the Dauphin dead, many worried and other saw opportunity for advancement. Frances would often appear in public with her son Charles and nephew Jean (Jean’s brain damage was yet unknown) reminding the public of the clear line of inheritance.
Additionally, Frances would summon Anne de Pisseleu d’Heilly back to court to tend to the King.”
Frances of France by Mariah Oliver
“With the responsibilities she would shoulder, Frances’s grief had to be private thing. And while she would grieve quietly, she would grieve for the rest of her life.”
Veronica Wells translation of François et Françoise de France