No Austria-Hungary

In a forum-based RPG I play, a French prince was once elected King of Hungary, only to be driven out six years later due to Habsburg pressure.
 
Delayed fall; instead of a fall of Constantinople from the outside the city might well just... well disappear; before the Ottoman Empire took it, the city had dwindled down to about 50.000 inhabitants and was bleeding citizens. Its entire hinterland was ottoman already well before the siege.

Byzantines actually controlled parts of Thrace with cities like Selymbria and Mesembria up until the end.
 
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