 Complete the following phrase:  After The creation of the enlarged Duchy of Nassau in 1806, Marschall von Bieberstein and Hans Christoph Ernst von Gagern headed up the government jointly. There were in effect two Regierungspräsidenten. While von Gagern focused on foreign policy, von Bieberstein took responsibility for domestic matters. However, Nassaus sovereignty was not unconstrained, and a new edict imperial in 1809 debarred those who had been born on the Left Bank of the Rhine from government service in any state other than France. The edict caught von Gagern who had been born near Worms and he resigned his office in 1809 or 1811 sources differ before retiring in 1811 to Vienna, where French imperial edicts were of less effect, especially after 