So this is my first attempt at a TL, and this one asks, "what if two princes had been luckier and survived into adulthood ?" Thanks to DrakeRlugia's "The Prince of Peace" for giving me an inspiration; as for the other prince, just wait and see... The Unifier: A Biography of the First King of Iberia Miguel I of the Avis-Trastamara dynasty, was born to Manuel I of Portugal and Isabella, Princess of Asturias, the firstborn daughter of Isabella of Castile and Ferdinand II of Aragon. Although Isabella first married to Afonso, the Crown Prince of Portugal, he died in 1491, and she very nearly entered a convent. She was later wed to Manuel, and gave birth to Miguel, though dying in childbirth. Miguel was a child destined for greatness from birth; he was seen as the hope to unite most of Iberia under a single crown. He became ill at the age of 2, however, he luckily survived. Had he died, the succession of Castile and Aragon would pass to his aunt Juana, who married the Habsburg Philip of Burgundy; this still meant that as long as Miguel had no heirs of his own the Habsburgs were still high on the line of succession. Fortunately, Miguel was an astute child, performing well in his studies. As his grandmother Isabella died in 1504, he drew closer to his destiny... This is all OTL. Spain and Portugal were united from 1580-1640, but under the Spanish Habsburgs. The POD, he dies in childhood in OTL but survives here. So, thoughts?