So earlier today I created the topic of Pre-XVIth Century Hohenzollern Rise and @Jan Olbracht brought up the idea of Frederick the Iron of Brandenburg becoming King of Poland and Lithuania, something I didn't even know was possible. While lurking because I was busy talking with my girlfriend, I looked up the potential of there being any threads of this idea being explored but so far, it seems I only found one, though I don't remember the exact title of the thread. So this thread is to discuss what might've happened to Europe, the Americas, and maybe beyond if Frederick II, Elector of Brandenburg (ITTL King Fryderyk I of Poland and King Frederikas I of Lithuania as well) became King of Poland and Lithuania? Would he have an eventual claim on the Bohemian and Hungarian thrones? If so, what happens then? If not, how does the Holy Roman Empire go with Habsburg influence severely limited to just Germany and maybe Iberia and Italy here? How does the reconquista, HYW, Mohacs, and colonization of the New World go in this scenario? Any ideas would help me in a future TL idea I'll work on once my US Political TL is half-way done, whichever one it might be.