 Thrasco had a son, Cedragus, the Obotrite prince from 819 to 826.The Obotrites were a Slavic tribe that lived on the shores of the Baltic sea on the areas of nowadays Mecklenburg and Holstein.Thrasco's father, Witzlaus II (r. 747-795), assumed power in 747, shortly after the death of his father Aribert II (r. 724-747).