United Duchies of Jülich-Cleves-Berg
Schönberg seems to have done a good job, because soon after his embassy to present the German nobles' concerns to Rudolf, Frederick despatched Schönberg to the Dutch Republic to persuade the States-General of the Netherlands to intervene in the Jülich succession dispute (after the death of John William, Duke of Jülich-Cleves-Berg on 25 March 1609, the United Duchies of Jülich-Cleves-Berg were claimed by both Wolfgang William, Count Palatine of Neuburg and John Sigismund, Elector of Brandenburg). He thereafter participated in discussion with the French ambassador Jacques Bongars at Düsseldorf.