Just as the title says, these three Princes all swap death dates. Instead of dying in 1502, Arthur dies in 1497, while John dies in 1506 instead of 1497, and Philip of Burgundy dies in 1502. What would the effects of this be? Obviously, John dying in 1506 means that he'll likely have three or more surviving children to succeed him, which would extend Isabella's lifespan by a few months/years, with one of them being guaranteed to marry into Portugal. What happens in England though? Does Henry VII negotiate Henry's marriage to Catherine of Aragon, or would he wait a while and opt for a more prestigious Princess (Eleanor of Austria or a daughter of John and Margaret) if one is available?