AHC: Largest Possible Political Union!

Does it have to be a Kingdom?

In any case, a stronger HRE which inherits Sicily, subjugates the Pope, manages to force Venice to toe the line and utilises the extension of the Teutonic and Livonian orders as being part of the HRE to spread control over Poland-Lithuania might do the trick.
 
An Ottoman Empire that integrates the Crimean Khanate, Atjeh, and Poland-Lithuania, and then goes on to conquer other lands.

Other than that: Centralized United Nations.
 
Does it have to be a Kingdom?

In any case, a stronger HRE which inherits Sicily, subjugates the Pope, manages to force Venice to toe the line and utilises the extension of the Teutonic and Livonian orders as being part of the HRE to spread control over Poland-Lithuania might do the trick.

So, A Holy Roman Empire comprising all of Italy, Grossdeutchland, and Poland-Lithuania?

Can it get bigger?
 
You could throw in the Low Countries as well since IIRC a large section of it was part of the Holy Roman Empire at one point or another.
 
You could throw in the Low Countries as well since IIRC a large section of it was part of the Holy Roman Empire at one point or another.

Plus of Course the bits of the Duchy of Burgundy and Lorraine that are now French, and possibly Arles and Provence at a push as well in that direction. Parts of Hungary and Dalmatia are also possibilities, and the Livonian Order included all of Estonia and Latvia.
 
the original HRE was pretty big under Charlemagne, then his son Louis the Pious expanded it even a bit more. Now lets start with letting Louis have only 1 successor, and let him be successful in expanding south & east and you get pretty big. Add a change in succession rules (only 1 son inherits the lands) and you have a pretty good start

size during Charlemagne:
300px-Frankish_Empire_481_to_814-en.svg.png
 

MSZ

Banned
Napoleonic Victory, leading to the "Continantal System" becoming a policy aimed at (and succeeding) in forming a Economo-Politico-Monarchic Union of European Kingdoms?
 
I smell a habsburg wank.

But technically if war of Spanish succession changed course and Phillipe does become king of Spain and France, this combined empire is bigger than anything else due to the colonial holdings.
 
Largest possible...for how long?

As in, does it have to be capable of enduring to the present? Or can it be something that lasts only a generation or two before receding (not necessarily collapsing, but receding)?
 
My suggestion before was for somewhat lasting longer

Largest possible...for how long?

As in, does it have to be capable of enduring to the present? Or can it be something that lasts only a generation or two before receding (not necessarily collapsing, but receding)?

in this respect the mongol empire was already rather big.

Mongol_dominions1.jpg
 
Suppose Charles V has no brother, Louis II still dies at Mohacs, and Philip II still marries Mary I?

Butterfly genocide, yes, but you get the Habsburg domains of the 16th century plus England.
 
The anti-Habsburgs successfully prevent the marriage between Sigismund III Vasa and Anne of Austria, leading Sigismund to marry a Swede two or three years down the line. This doesn't necessarily butterfly the War Against Sigismund, but tilts the war far more in his favor as more nobles would see him as legitimate. This would later be known as the Commonwealth Civil War, and would strengthen the bond between the Poland-Lithuania and Sweden, politically and possibly even religiously.

Down the line, the Commonwealth would go to war with Russia as it did IOTL during the Time of Troubles. The Commonwealth-Muscovite War would be far more successful for the far more powerful Commonwealth and would ultimately lead to the annexation of the Tsardom of Russia into the Commonwealth.

Notes: Polish would stay neutral in the ATL 30 Years war to consolidate its gains. Without Sweden in the mix, the Catholics may win. This will lead to a bipolar world, with the Commonwealth on one side and the Hapsburgs on the other.
Gustavus Adolophus would not be a leader of Switzerland.

Commonwealth.PNG

Commonwealth.PNG
 
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What about an Anglo-Russian Union? I haven't looked through to see if there was any time when this would be possible, but theoretically it adds the colonial possessions of England with the trans-continental expanse of Russia.
 
The problem with most of these is that monarchs are limited by traditional power structures in the nobility and merchant classes, without having big enough armies to project power.

Napoleon, however, has none of these problems, and plenty of vision. If you can find some way for him to coexist with Russia and survive, I can certainly imagine him forming a Union of Europe, with him as Emperor.
 
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