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What if Albrecht V. of Habsburg does not inherit Sigismund in 1437/8, only to die himself in 1439, leaving a posthumous male heir (Ladislaus Postumus) and Hungary in a succession struggle?
What if, instead, he dies ten years earlier, in 1429? For example, in one of the wars he`s conducting for his father-in-law against the Hussites?
Who inherits his Austrian dukedom?
And who will follow after Sigismund in Hungary?