What happened OTL was that Carlos II of Navarre didn't much care for his brother-in-law, Gaston Febus de Foix. Carlod duped his nephew, another Gaston, into believing that poison was actually a love potion to bring his parents back together (or some such), and tasked him to administer it to his dad.
Of course, Gaston III wasn't so trusting, and supposedly killed his son himself, thus extinguishing the LEGITIMATE line of Foix heirs. Gaston III later named the king of France as his heir, but the Estates-General refused to ratify this.
So...what if...by some circumstance, Gaston III DOES wind up dead - perhaps he takes the poison or perhaps he's killed in a hunt shortly before his son planned to administer it.
What does this change? How does this affect things?
Of course, Gaston III wasn't so trusting, and supposedly killed his son himself, thus extinguishing the LEGITIMATE line of Foix heirs. Gaston III later named the king of France as his heir, but the Estates-General refused to ratify this.
So...what if...by some circumstance, Gaston III DOES wind up dead - perhaps he takes the poison or perhaps he's killed in a hunt shortly before his son planned to administer it.
What does this change? How does this affect things?