Have you ever heard of the Khazars?

Question

THE KHAZAR EMPIRE AND ITS HERITAGE

This book traces the history of the ancient Khazar Empire, a major but almost forgotten power in Eastern Europe, which in the Dark Ages became converted to Judaism. Khazaria was finally wiped out by the forces of Genghis Khan, but evidence indicates that the Khazars themselves migrated to Poland and formed the cradle of Western Jewry. . .

Answer 1

Yes, you explained it well!

Khazaria is sometimes referred to as the 13th Tribe of Israel!

Answer 2

Why are you answering your own question?

So some of the Khazars survived the Mongol invasion and moved to Europe! So what?

Poland is the Cradle of western Jewry?

Proof?  

There were Jews throughout Western and Eastern Europe Europe long before that!