WI: Best-Case Scenario for the Catholic Monarchs. Juana la Beltraneja dies in 1472, before her father, and Henry IV is forced to recognize Isabella as his heir. This allows the couple to avoid the war with Portugal.
Ferdinand II of Aragon (1452-1516) m. Isabella I of Castile (1451-1524) 
1a. Isabella of Castile and Aragon (1470-) m. Edward V of England (1470-1492) 
1a. Elizabeth I of England (1486-)
2a. Jacquetta of England (1489-)
3a. Richard III of England (1492-1504)
2a. Juan III of Castile and Aragon (1473-1511) m. Catherine I of Navarre (1468 -) 
1a. Miscarried Daughter (1492)
2a. Isabella of Castile and Aragon (1492-1494)
3a. Maria of Castile and Aragon (1494-1505)
4a. Stillborn Son (1494)
5a. Miscarried Daughter (1496)
6a. Catalina of Castile and Aragon (1500-1511)
7a. Stillborn Daughter (1502)
3a. Juana of Castile and Aragon (1475-) m. Alfonso VI of Portugal (1475-) 
1a. Maria of Portugal (1493-)
2a. John III of Portugal (1494-)
3a. Miscarried Son (1498)
4a. Ferdinand, Duke of Beja (1502-)
5a. Alfonso, Archbishop of Guarda (1505-)
4a. Ferdinand VI of Castile and Aragon (1476-) m. Louise of Savoy (1476-) 
1a. Alfonso VII of Castile and Aragon (1495-)
2a. Isabella of Castile and Aragon (1495-)
3a. Ferdinand, Duke of Granada (1497-1499)
4a. Enrique, Archbishop of Burgos (1501-)
5a. Stillborn Daughter (1505)
5a. Alfonso, Duke of Cadiz (1477-) m. Elizabeth of Denmark (1485-) 
1a. Isabella of Cadiz (1503-)
2a. Alfonso of Cadiz (1507-1509)
3a. Miscarried Daughter (1510)
4a. Leonor of Cadiz (1510-1513)
5a. Stillborn Son (1511)
6a. Enrique, Duke of Cadiz (1511-)
6a. Miguel of Castile and Aragon (1478-1482)
7a. Stillborn Daughter (1479)
8a. Maria of Castile and Aragon (1482-) m. Charles VIII of France (1470-) 
1a. Isabelle of France (1500-1514)
2a. Miscarried Son (1501)
3a. Charles, Dauphin of France (1504-1508)
4a. Charlotte of France (1506-)
5a. Louis, Dauphin of France (1510-1517)
6a. Marie of France (1512-)
7a. Philippe VII of France (1512-)
8a. Jean, Duke of Berry (1515-1529)
9a. Stillborn Daughter (1518)
10a. Francis, Duke of Anjou (1518-1520)
9a. Ana of Castile and Aragon (1482-1484)
10a. Catalina of Castile and Aragon (1485-) m. Ernest, King of the Romans (1486-1503) 
1a. Elisabeth of Austria (1502-) -abbess-
2a. Miscarried Son (1503)
 The reconquest of Granada still occurs. Butterflies call for a crusade against the Ottomans in the late 1490s/early 1500s. Eventually all of Greece and Constantinople are reconquered. In 1524, Jerusalem is finally taken from the Muslims. Isabella, old and frail, travels to the Holy City, and will die there. She will be buried in the Church of the Holy Sepulcher. Isabella manages to enforce her will in the Americas, and the Natives are treated much better, though smallpox is still rampant.
 Isabella, anglicized Elizabeth, and Edward have a harmonious and happy marriage. Edward is much like his father, tall, blonde, and broad, with a desire to war with the French. Isabella has a kindly and pious nature, which makes her very popular with the common people and nobility alike. Edward manages to take back Rouen in Normandy before he dies in battle. His wife, heavily pregnant upon his death, gives birth to a posthumous son. She is regent for the boy, until he dies, and continues to remain an important advisor to her daughter, England’s first undisputed Queen-Regnant, married to the heir to the Danish throne. Isabella will join her mother in the Holy Land, and will eventually be buried alongside her.
 Juan and Catherine seemed to have a cloud of bad luck always hanging over them. The two, betrothed since childhood, instantly disliked each other. Juan found Catherine to be unattractive, and Catherine found Juan argumentative and annoying. Out of their seven children, only three were born alive, and none made it past the age of eleven. Catherine was hated by the court for her snobbish and anti-social behavior, so she stayed mostly in Pamplona, separated from her daughters, who were raised and educated by their Castilian grandmother. Juan crusaded against the Ottomans, and has numerous affairs with many women. He officially had 11 illegitimate children, but he privately recognized as many as 30. Some historians have argued he probably had as many as fifty children. Catherine died in 1517, in a convent where she had been imprisoned after her brother-in-law had captured her kingdom.
 Juana was, from a young age, the most beautiful of the Aragon girls. She was also dignified and elegant, tall with strawberry blonde hair like her mother. Her marriage to Alfonso was normal for the period, and Juana took a particular interest in her children’s education. Juana herself was very intelligent and kept the largest library in the world at the time. She also hosted intellectuals and artists at the palace.
 If Juana was beautiful, than Ferdinand was cunning. As a child, he was known to play tricks on his siblings, and cause chaos for his nursemaids. He grew into an energetic, good-tempered, and handsome young man. His marriage to Louise of Savoy was largely a success, and the two, using Isabella’s fondness for her second son, carved out favors and land for their children. Louise was delighted when, one by one, her brother-in-laws children died. Ferdinand proved a popular and wise king, and Queen Luisa was praised for her beauty and for the festivities she hosted at court.
 Alfonso was somewhat of the black sheep of the family. His younger brother, Infante Miguel, had been given as an oblate, though he had died at the age of four after he caught cold. Isabella wished to offer her third son to the church, but Ferdinand insisted he remain in the secular world. Alfonso himself was lazy in his studies, preferring to write poetry and compose songs. He refused to marry on several occasions, probably because he was a homosexual. He also developed the nasty habit of being a drunk, and gambling. Because of all these unsavory rumors, Isabella and Ferdinand finally forced Alfonso to marry Danish Princess Elizabeth. Elizabeth desperately loved her husband, but her husband did not return her affections. After the birth of Enrique, heir to the Dukedom of Girona, the couple finally separated. A few years later, in 1517, it became clear that Alfonso had caught a sexual disease from one of his lovers. This disease would eventually kill him.
 Charles VIII marries Margaret of Austria in 1494. She dies giving birth to a stillborn daughter in 1498. Anne of Brittany would marry Richard, Duke of York and Normandy, and the two ruled over a joint Breton-Norman Kingdom. After Margaret died, Maria was sent to marry the widower. Charles and Maria did not love each other, but were at least friendly. Certainly they mist have been somewhat close, for the marriage would result in ten children.
 Catalina, the baby of the family, was a sweet and devoutly pious young woman. She would marry Ernest of Austria, the eldest son of Emperor Maximilian I and Elizabeth of York. Ernest had been promised the Holy Roman Empire as an inheritance. This caused some drama, because Philip, Maximilian’s eldest son from a first marriage, and also Duke of Burgundy, believed he should be heir. Ernest and Catherine were happy together during their brief marriage, but he two caught influenza in the spring of 1503, which killed Ernest and made Catalina miscarry their second child. When Philip became Emperor in 1509, he made a frequent point to bully and make fun of Elizabeth of York and Catalina. The two lived at a convent outside Vienna. Anne of York, Holy Roman Empress, was herself miserable, especially after her only child, Charles, died in 1512. Philip would die in 1516, childless. Ernest’s only child, daughter Elisabeth was ineligible to succeed, so Ernest’s younger brother, Fredrick, married to a Polish princess with a load of children, became Emperor. Elizabeth of York would return to court, dying in 1543. Catherine would stay at her convent, becoming a nun, and eventually abbess. She was extremely pious, and took care of the poor and sick in her hospitals. Several miracles, including healing, were attributed to her. She finally died in 1570, at the age of 85, miraculous for that time. In 1595, she was canonized as a Saint.