Why did Francis die in the third season of The Queen in the Wind?

Thanks to Delphine's help, Francis seems to have recovered. Mary and Elizabeth signed a new peace agreement, and Mary gave up the throne of England. However, Nostradamus said that he foresaw Francis' death again.

On the trip to Paris, Francis left Mary alone in the castle. Mary was kidnapped by robbers, and Francis rushed to the rescue, but was seriously injured in the crossfire.

On his deathbed, Francis asked Mary to stay in France until Charlie's throne was consolidated, and wished Mary happiness again after her death.

Plot:

Mary spent 10 years in the French court. 1558, Mary, who was dissatisfied with 16 years old, married French Crown Prince Toby Regbo.

Francis ascended the French throne on 1559, but died a year later. 18-year-old girl widow Mary returned to Scotland on 156 1. Mary is dissatisfied with Scottish aristocrats and Calvinists because she believes in Catholicism.

He was deposed in 1567 and fled to England the following year. He has been under house arrest by the Queen of England and her cousin Elizabeth. 1587, Mary was guillotined by Elizabeth I for treason.