As the tin says, what if Maximilian Habsburg died in 1478 shortly after the birth of his son Philip? Obviously, Mary of Burgundy is going to remarry asap since she needs a powerful husband to help defend Burgundy from France but to whom? All of Edward IV’s brothers are married and his Woodville cousins are bit too low for her, not to mention the fact he’s an unreliable ally. Might she marry a rebellious French noble? Secondly, how do the Habsburgs react? Frederick III has no other son and is a widower so might he remarry? Might his cousin Sigismund try to position himself as an alternative heir to the young Philip? What else might change?