November, 1478: James III of Scotland is captured by Baldwin of Burgundy, and taken as a prisoner to to the Tower of London. Jasper Tudor stays behind to finish off the remaining forces, and travels into Scotland to take as his prisoner Richard of York. Margaret of Denmark, aware that he is her major bargaining chip to bring her husband back to Edinburgh, has the Yorkist Pretender placed into custody and prepares to send him to London for trial. His wife, meanwhile, continues to negotiate with her brother to send forces to help the Scottish Invasion. Her requests, however, are rebuffed by Alfonso, focused on Sardinia and potentially Aragon.
In Armagnac, the Infante Jean of Aragon, as Regent of Armagnac, makes an executive decision. The Scots have failed, the alliances his mother has been making are not working, and he needs to bring on some allies to their side, particularly as the Hapsburgs dither on her newest attempt at filling up the ranks. And so, he negotiates his nephew to Marie de Berry (a cousin, but the Pope can waive that issue), and his niece, formerly the future Queen of Scotland, to marry the young Prince of France, now the Duke of Berry. Eleanor, unaware of his plans, has also had second thoughts about the Scottish match, but had focused on Portugal, hoping to have the young Infante Alfonso marry her, and her nephew to the eldest daughter of the Duke of Brittany. George of York and Mascarose factor in very little to these plans, although they attend the ceremony for the betrothal between the Count of Armagnac and Marie de Berry. Their own son, Edward of York, dies shortly after birth.
The Portuguese, meanwhile, are finalising their full consent to the offer from Juana I of Castile when, surprisingly, the Prince of Portugal makes an announcement. He's already remarried. His bride, Guiomar of Braganza, the widow of Henrique de Meneses, Count of Viana do Alentejo, is herself a mother of three and at least 5 years the Prince's senior. They've apparently been married for over a year and the alleged Princess of Portugal is heavily pregnant. The King is not happy at all.
December, 1478 - January, 1479: Richard of York's handover to the English Party is done as smoothly as possible when the prisoner believes he can escape at any moment. The Yorkist Pretender, having caused so much havoc, attempts everything to get away from Jasper Tudor's grasp. This includes dressing as a washer woman and, at one point, knocking a man down a flight of stairs. Not very gallant of him. But regardless, he arrives on English soil and is executed before they proceed to London. It's likely that this was agreed upon by the council secretly, but Jasper Tudor will hold that it was his decision. Regardless, the threat is dead and, in order to achieve his freedom, the King of Scots agrees to marry his eldest son to Margaret of Lancaster, while the Duke of Ross is betrothed to Anne of Burgundy, Anne Neville's daughter. He remains in English custody for the time being, treated as well as they can.
In Naples, the Infanta Beatrice is devastated. Her brother, understandably annoyed his father's gambit cost them time and money they didn't need to spend, focuses his attentions on Sardinia. Because things are starting to look up a little for Eleanor of Aragon.
The Holy Roman Emperor has considered her proposal and, due to their shared ally in Louis XI of France, who's sister has managed to have reinforcements sent to Aragon to help them at least stave off the Neapolitan forces, agrees to a match between Maximilian and Isabella of Foix, partially as a counter measure to the Hungarian alliance with Naples, which he sees as dangerous. He sends men and money to his new ally, and Eleanor sends men to the Pope to secure a dispensation. The two parties host proxy marriages and Isabella is prepared for her travels to Austria. Thankfully, she was already prepared for Burgundy, so the packing is quick.
February, 1479: News hits the Duke of Burgundy, almost 13, that his intended bride is instead off to marry the Archduke of Austria, and he's deeply upset about it. It isn't even that he isn't to be married yet (he isn't even yet 13), it's that he's been jilted a second time. He's a royal Duke! In line for the French Throne! That should be good enough for any Princess. And so, frustrated, he forms an alliance with the Duke of Orleans, himself yet unmarried but currently courting the widowed Duchess of Berry. Without permission from the King of France, he is betrothed Marie d'Orleans, a woman 9 years his senior. The King immediately writes to the Pope to block a dispensation.
Likewise, another King is trying to block a dispensation, and that is King Alfonso V of Portugal. His son's little stunt with Guiomar of Braganza might be cute for a mistress, but this cannot be how the next generation of royal children is brought into the world. His own wife being somewhat thrust upon him is embarrassing enough (not enough to stop her becoming pregnant earlier in the year, but embarrassing), but his son spurning the biggest heiress in Europe for a local widow is unfathomable. But when John reveals that he had already sent his own emissaries to the Pope, who granted John a blanket dispensation to marry any woman as close to him as a first cousin, he's blocked. The Princess of Portugal is duly accepted into the royal family, and gives birth to a daughter, Beatriz of Portugal, who joins her aunts in the royal nursery. Margaret of York shuns her stepdaughter-in-law along with her husband, and prepares for her own lying in.
The Duchess of Brittany gives birth for a second time, this one successfully. This child, a daughter, is named Charlotte, for the French Queen, and Anne of Savoy thrills in her living child (the previous child, another daughter named Francoise, had died a month after birth in 1477). Her sister in Lorraine, meanwhile, give birth to a stillborn son.
May, 1479: Isabella of Foix, Infanta of Aragon makes it to Austria, where she and her husband finally meet and she cannot have her marriage once again set aside for her mother's alliances. The two get along well, and Frederick of Austria admires his daughter-in-law's beauty and willingness to settle into the more informal court style they host. They cannot stay long, however, as Frederick travels through to Savoy, where he will demand the Duke of Savoy join their fight against Naples.
Meanwhile, Claude of France has been jilted by John of Portugal in two ways, and thus Louis XI needs a new future groom for his younger daughter. His sights now set upon the future Duke of Brittany, Francis II of Brittany dangles as a marriage option for the King in exchange for a treaty that protects Breton independence. But obviously, little Francis, Count of Montfort isn't the only fish in the sea. There's an entire King of England off waiting, and a newly spurned Prince of Girona who might be the key for keeping the Foix Aragon on his side should this Hapsburg alliance work out. And if he can just stop this insane Burgundy/Orleans alliances, maybe Claude would be best suited for there.
In Castile, Juana I of Castile is kind of locked. Her former husband is the most obvious choice for her, but he's representative of everything she hates. Her cousin's obvious mental scars from years of neglect and mistreatment are signs enough that she will have nothing to do with the Foix dynasty. So, she decides to chose their rivals, and finds herself betrothed not to Francis Phoebus, Prince of Girna and Viana, but Ferdinand, Duke of Calabria, the 10 year old son and heir of Alfonso II of Naples and Sicily. She then tells her generals to prepare for an invasion of Aragon and Navarre.