Jeanne d'Albert dies in childbirth

Jeanne d'Albert, daughter of Henry II, king of Navarre dies few hours after giving birth to her son Henry (OTL Henry IV of France) who still is healthly child in this TL . So the newborn will be heir to the throne of Navarre since his birth, and king of Navarre after his grandfather dies in may 1555, leaving 1,5 years old grandson on the throne. So in such situation would a Henry's father Antoine became regent? Antoine was not very religious, changing confession was not problem for him-he reconverted to Catholicism IOTL and fought Hugenots. Henry, raised by his father would likely remain Catholic, his uncle Louis would be main leader of protestants, but he was further in succession line. So assuming minimal butterflies France has Catholic heir to the throne after Valois extinction. What would be effect of such change? St. Bartholomew Day massacre is certainly butterflied away, and Catholic League has less support without fear of Hugenot taking the throne.
 
Antoine, Duc de Bourbon was kinda weak when it came to the French royal family, in particular Catherine de Medici. Bear in mind, he agreed to give her the Regency at one point when it really might have gone to him. Catherine de Medici is probably going to demand that little Henri de Bourbon, III of Navarre, heir to the Duc de Bourbon, be raised amongst her own sons. Catherine ended up raising him for a time OTL, so ITL it isn't that bug a stretch, and it probably happens earlier. Not while Henri II of Navarre is still alive, but definitely from 1555 forward.

Antoine de Bourbon, Duc de Bourbon is going to remarry. He's got one son and at least a decade to find a new bride. If Henri II of France dies on schedule, then he may marry one of Catherine de Medici's beautiful women of the court, or perhaps, if he is still unmarried as of 1560, he might remarry to Mary I of Scotland. With a marriage to the Queen of Scots, he has a chance to have children on two different thrones. Hell, considering Antoine is a handsome, obviously man in his early 40's with no real religious convictions, he'd be the perfect husband for the Queen of Scots. But, most likely, he's married by 1560, possibly to Françoise de Rohan (his first wife's cousin) or Renata of Lorraine.
 
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