May I ask why?
So will the Polish people ITTL eventually become Jewish or not? Becouse I think you should have them become Jewish.
Age of Vikings
On the Kingdom of Germany, Theophanu gives birth to a son she names Philip on 974 AD, and Prince Basil of Byzantium was made as one of his own Godfathers, Prince Basil was a very powerful influence on Prince Philip’s life, Prince Basil saw a beautiful German woman at the court of Otto I and instantly falls inlove with her and her name is Gutta, Gutta married Prince Basil.
Otto I dies and Otto II is crowned as the Holy Roman Emperor in 975 AD.
Otto II and Prince Basil become good friends when Basil visited the Kingdom of Germany after Otto II’s coronation in 975 AD, in 976, Prince Basil became the Emperor of the Romans or the Rhomanoi and became known as Basil II, Theophana gives birth to a son named Philip in 978.
Boleslav I died and Boleslav II rose as the King of Bohemia in 973, King Boleslav II was very much enthusiastic in ruling Bohemia when he was crowned after the death of his own father, Boleslaw II was quite reculant in being the King of Bohemia and was very pious and made initial reforms in the Kingdom of Bohemia, Boleslav II was known in his piousness and his wit, Boleslav II taught Vratislav of how to be a good leader while Matilda of Germany treated Vratslav very gently and gave him a good home, at this time he was very nice to the families Slezavyc and Slavnik which are rivals to the Premyslids, he did no harm to these families because they are his great supporters. In 980, Mathilda of Germany dies, the nobility of Polans and a fraction of the people of Polans convert to Judaism and the Wends too west of Oder also start to convert to Judaism as well.
The marriage between Sweyn Forkbeard and Anna Sviatoslavna proceeded in 980 AD after many negotiations between the Rus and Denmark, Sviatoslav dies a few months after their wedding and was replaced by King Vyacheslav I of Kiev, Sweyn Forkbeard and Anna Sviatoslavna visited the wake of King Sviatoslav of Kiev and Doubravka was seen by her daughter Anna on mourning clothes, a few months after Olga of Kiev died as well. Anna Sviatoslavna later gave birth to a son she named Vladimir and known by his people as Valdemar, but the Pomeranians call him Vladimir, Harald Bluetooth died in 981 and Sweyn Forkbeard became the King of Denmark in the meantime Boguslav I of Pomerania annexes Poznan and Gniezno from the Polans and thus Polans retaining mostly Masovia starts to gradually convert to Judaism. King Vladimir or Valdemar I of Denmark becomes known in ruling Denmark and he was called great because he Vassalized Norway, Pomerania and England, he is the son of Anna Svatoslavovna and Sweyn Forkbeard, King of Denmark and also Grandson of Sviatoslav and Doubravka Boleslavovna, he was a good ally of Bohemia and Rus, the following year in 982, King Vyacheslav of Rus was married to Princess Anna Porphyrogenita, the sister of Prince Basil of the Byzantine Empire who later bore him a son named Basil Vyacheslav in 983, Judith of Hungary married Prince Vratislav of Bohemia in 985 who bore him a son named Bezprym in 986 and after a year also bore him a son named Boleslav in 987.
King Vyacheslav became closer to the Byzantine Empire due to his marriage to Anna Porphygenita, Doubravka of Bohemia, dowager Queen of Rus dies in 990.
King Boleslav II dies in 1000, King Vratislav the Great of Bohemia or Vratislav Chrabry or Vratislav II of Bohemia was known in being cruel and expansionist and wanted to prevent the rise of a Jewish country in Central Europe, he is the son of Mathilda of Germany and Boleslav II of Bohemia but he was revered as a great King because he conquered Lusatia from the ruler of Meissen and from the jurisdiction of the Holy Roman Empire. King Vratislav II of Bohemia blinded and later killed Lestek II, Duke of Polans, Lestek II was later replaced by Siemovit II of Polans,Vratislav the great married Judith of Hungary and his sons and successors are named Bezprym and Boleslav, he gave the lands of the Lachy(Silesia, Calisia, Sandomir and Krakovia) to Bezprym and the Czech lands to Boleslav, and due to the partition the Kingdom of Lechia was established.