You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser.
alternatehistory.com
I heard that the Kuyavian Piasts have less heirs, what if Leszek the Black had many children with Agrippina of Slavonia, what will happen will Kuyavian Piasts fragment just like the Silesian and the Masovian branches.