What if the House of Babenberger never sold Austria making Bohemia, Bavaria or Brandenburg the dominant power in the Holy Roman Empire?

This I think, is a very interesting timeline, who do you think could have replaced Austria or do you think that nobody would be dominant?
 
If i can remember well, there was no "sale" OTL - the house just went extinct in the male line in 1246 , then Ottokar of Bohemia took over Austria and Styria, and then Rudolf of Habsburg took those from him in turn.

But whatever divergence happens, they would have to go to somebody. Another alternative is having Herman VI of Baden (who was married to the niece of the last Babenberg duke) prevail over Ottokar, which might have consequences for the strugle between the Hohenstaufens and their enemies.

However, remember that Austria and Styria were little less than half of Habsburg Austria - by 1246, Carinthia, Carniola and Tyrol (which was considerably smaller as well, since they still hadn't acquired the lands they did after the Andechs died out) were all under independent lines - Carinthia and Carniola wound up going the same way as Austria and Styria once the last Sponheim duke died, and Tyrol was only incorporated in the 14th century. And there was also the County of Celje, which itself only went under Habsburg possession in the 15th century.
 
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If i can remember well, there was no "sale" OTL - the house just went extinct in the male line in 1246 , then Ottokar of Bohemia took over Austria and Styria, and then Rudolf of Habsburg took those from him in turn.
Ottokar II of Bohemia married a Babenberg heiress 20 years his senior and took over the duchies of Austria & Styria, later he added to this the duchy of Carinthia and the margraviate of Carniola (including a bit of Istria). He eventually repudiated her for a much younger Hungarian princess.
The reason he could do this was the Great Interregnum after the Staufer (Hohenstaufen) Imperial house went extinct and the Prince Electors had elected two king of the Romans, Richard of Cornwall (pro Welf faction) and Alfonso of Castile (former Staufer supporters). This period lasted almost 20 years and allowed Ottokar and other Imperial Princes to illegally seize those territories.
To end the anarchy the Prince Electors eventually agreed on a compromise candidate, count Rudolf of Habsburg , a prominent noble from Swabia, experienced yet relatively old.
Rudolf had many daughters, which he married to the dukes of Saxony, Lower Bavaria and Upper Bavaria and the margrave of Brandenburg, his eldest son Albrecht was married to the daughter of the count of Tirol. The Imperial diet agreed that illegally seized fiefs were to be returned and dealt with in a legal matter (note that almost every Imperial Prince had done so, including Rudolf, but none to the same degree as Ottokar), Rudolf was wise enough to devolve many of this to highest Imperial Princes, who supported him, but all of them agreed that Ottokar, king of Bohemia, should be taken down a peg.
It took 2 battles in the first Rudolf had the support of the Imperial Princes and defeated Ottokar (1276), who was then restored to his ancestral lands Bohemia and Moravia as Imperial Fiefs. Austria, Styria, Carinthia and Carniola were put under the Imperial Administration (Rudolf already had the desire to increase his dynastic lands).
In 1278 it came to a second conflict with Ottokar, this time Rudolf only had his own allies (including the king of Hungary) and some Imperial Princes now even sided with Ottokar. This was another, now personal, victory for Rudolf. This allowed him to invest his son Albrecht and Rudolf with the duchies of Austria & Styria. His ally and father in law of Albrecht, the count of Tirol was invested with the duchy of Carinthia and the margraviate of Carniola (with the provision the Habsburgs could inherit these, if his line would end without heirs).
 
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Also the house of Babenberger usually refers to the older Franconian house of Babenberg, not the younger Austrian house of Babenberg (disputed relation between the two).

As for the question, both Bavaria and Bohemia were in a better location than Brandenburg for this.
 

Math

Kicked
A surviving son of Frederick II would be interesting, Frederick was the son of a Byzantine princess Angeloi and his first wife was a Laskaris (Son of theodoros I laskaris of Nikaea), And if I'm not mistaken, your great-grandmother or great-great-grandmother was a kommene granddaughter of John II
 
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I suspect it would devolve into a three-way contest between Bavaria, Bohemia and Brandenburg.. If this contest continues long enough, Saxony could even get embroiled and make it a four-way contest.
 
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