I Mestwin
I was born about 1160 in Gdansk, Gdansk, Poland.  He died on May 1st, 1220 in Kloster Oliva, Westpreussen, Prussia.

 Princess of Great Poland Zwinislawa
Princess of Great Poland was born about 1166 in Poznan, Poznan, Poland.  She died on September 4th, 1240.

 Princess of Eastern Pomerania Jadwiga
Princess of Eastern Pomerania was born about 1196 in Gdansk, Gdansk, Poland.  She died on December 29th, 1249.