In 1502, shortly after the royal wedding, Arthur Tudor and his bride Catherine of Aragon both became ill with sweating sickness. IOTL Catherine of Aragon survived while her new husband perished, leaving Arthur's little brother Henry as heir to England. However, what if the young couple's fates were reversed, and it was Arthur who pulled through while Catherine met her end in Wales? Who would the now widowed Arthur marry? Catherine has no single siblings, thus England will have to look outside Spain for a bride. Without Arthur's death leaving England without a spare his parents likely don't have another baby in hopes of securing the succession and Elizabeth of York survives. How might this impact the remainder of Henry VII's reign and the beginning of Arthur's? How might the death of her youngest daughter, not long after the loss of the Prince of Asturias, Isabel, and Miguel de la Paz, impact Isabella I's already suspect health? What would be the consequences if Isabella dies ahead of schedule? Any other thoughts on how this change of fates impacts the timeline.