WI:Mazovia merges with Brandenburg

Is it possible for Brandenburg to inherit Mazovia, what would be the consequences of Brandenburg having both Mazovia and Prussia.
 
When should it happen? Masovian duchies belonged to the branch of Piast family which, unlike the main branch, lasted until XVIth century. Also, since reunification of Poland Masovia was very close to Poland, with Masovian dukes often being vassals of Polish kings.
 
When should it happen? Masovian duchies belonged to the branch of Piast family which, unlike the main branch, lasted until XVIth century. Also, since reunification of Poland Masovia was very close to Poland, with Masovian dukes often being vassals of Polish kings.

Perhaps the POD should be during the Mongol Invasion, the Masovian Piasts fight the Mongols more and the Silesian Piasts would pay tribute to the Mongols and allying with the HRE making the Masovian Piasts more weak and ally with Brandenburg and make an inheritance pact with Brandenburg, I think they could also make an inheritance pact with Lithuania if it christianizes.

I did forgot to say that the Silesian Piasts tried to return to the Polish throne before they got extinct.
 
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