So, I am planning a timeline where Charles I wins the civil war, however, before that, I have several other things that I wish to change.
These include:
1) The Portuguese succession issue, either by having more of John III's sons before Joao Manuel survive, or having Joao himself survive for longer and have more kids.
2) The Low COuntries, either avoiding or wrapping up the mess there quickly, by giving Charles V/I a son to rule over the area, or by having him or his son be up for compromise.
3) Ottoman Empire, either having one big long succession crisis, or a series of them.
4) More of Philip II of Spain and Anna of Austria's sons surviving.
I would love to know your thoughts on these issues, and whether they will have big or small impacts on the timeline.