The 19th century German historian Johann Ludwig Quandt believed that Zemuzil and other early Pomeranian dukes of the Griffin dynasty descended from Polish nobility of Lesser Poland, that Zemuzil was made a voivode of his duchy by the Polish king Bolesław I Chrobry, and that he was the grand father of Świętobor I.
According to 19th-century German historian Johann Ludwig Quandt, Zemuzil and other early Pomeranian dukes of the Griffin dynasty were likely descended from Polish nobility in Lesser Poland. He also suggested that Zemuzil was appointed voivode by Polish king Bolesław I Chrobry and that he was the grandfather of Świętobor I.