Henry IV of France and III of Navarre
Henry IV of France
The sons of Henry II of France would die one by one since his reign in 1549 without issue Francis II d. 1560, Charles IX d. 1574 and Henry III of France d. 1590, during these times was during the time of the French wars of religion.
During this time Maria of Portugal, the daughter of the old French Queen, Eleanor of Austria from her first marriage who married Antoine was in the French court, Antoine and Maria were said to be very ambitious for their son, Charles b. 1550 and wanted to guarantee his succession but the parliament would support the succession of Louis in case that the descendants of Francis I are extinct and the marriage with Margaret of Valois with his son Henry in 1570 ended this doubts and ruined the ambitions of Maria of Portugal in contesting the succession of the grandchild of the constable.
Louis XIII would succeed however his grandfather is remembered as a traitor and his son, Henry of Navarre would try to get the hand of Catherine Michelle of Spain and divorce his first wife, Margaret of France who he married in 1570’s to reconcile with the Valois and return to the French court the Kings of Navarre, however, since Catherine Michelle is married to Ranuccio Farnese, his attention would go to Mary of England who he started to negotiate a marriage in 1593, he would ask for a divorce to his infertile first wife, Margaret of Valois, later known as Reine Margot who would ask the king for her to give her the status of a queen in her divorce which was finalized in 1594, in which he was married soon to Mary of Spain or Infanta Maria of Spain, the only daughter of the Prince of Asturias who is just 22 years old at the time of the wedding in order to secure peace between Spain and France.
On 1577, Catherine of Navarre, the Grand daughter of Louis XIII had married the Hereditary Duke of Lorraine, a marriage that would produce two children, namely Francis b. October 3, 1579 and Claude of Lorraine b. October 6, 1583.
The death of Louis XIII in 1602 would make Henry IV, King of France and the death of Queen Jeanne III of Navarre in 1605 would make Henry IV also Henry III of Navarre and integrate her French lands to the Royal demesne.
Louis XIII would unite the line of the former fiancée of Charles VIII, the late Margaret of Austria to the French throne, something that Margaret of Austria did not predict even if she died in the same time as Prince Francis II of France.
The French would secure their colonies due to the marriage of Infanta Maria to the French King, Henry IV in 1595, Infanta Maria is the daughter of the Prince of Asturias and the grand daughter of Philip II, the French would monopolize the Eastern Seaboard of the Americas and another marriage between his niece Claude of Lorraine to Infante Felipe of Spain, the son of Charles II of Spain, the two marriage would include the security of the French colonies and in the North of New Spain and Spain no longer claiming the due to the treaty of Tordesillas.
The renunciation on the part of Spain would benefit the French since they will never be bother of their settlements and this would mean that the French can securely continue their plans to colonize the Mississippi River.
note:
Catherine of England will produce children analogous to the OTL children of Catherine Michelle and Henry IV's kids with Mary of Spain are analogous to the OTL Children of Maria de Medicis with Henry IV, Maria de Medici is butterflied in this TL.