WI:Earlier Poland-Lithuania

What if Henry the Pious was able to win the battle of Legnica and was crowned King and Boleslaw the Bald marries Mindaugas' daughter which leads to a Polish claim to Lithuania after the death of Vaišvilkas and Mindaugas, if the union between Lithuania and Poland happens in this period but under the Silesian Piasts, how would this Poland-Lithuania would look like.
 
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