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At one point the Piasts became so numerous that it caused fragmentation of Poland between rival dukes.
This video shows Piast dynasty geneaological tree, only Piasts born between ca. 1100 - ca. 1310:
https://www.youtube.com/watch?v=woDdgTZopVw
This video shows how borders of districts and duchies ruled by each prince were changing over time:
https://www.youtube.com/watch?v=P-Yr06xWvlw
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