The only two persons who could be identified as the brothers were John (who was an adviser of the Duchy and a lawyer) and Jakob (known as Magister, so probably a doctor), sons of one Goćwina, who was a doctor in the court of Henry III the White.
Singurele persoane care au putut fi identificate erau John (care era consilierul ducal și avocat) și Jakob ( un medic cunoscut sub numele de Magister), fii lui Goćwina, care a fost medicul din instanța de judecată a lui Henric al III-lea ce Alb.