Since 1851, Otto von Bismarck had been serving as the Prussian ambassador to the German Confederation headquartered at Frankfurt-am-Main, a free city of the Confederation in what is now western Germany [REF].
Rothschild gave the name of Gerson Bleichröder, who took over Bismarck's private banking transactions as well as the transfer of credits and/or placing of loans on behalf of the Prussian state and the German Empire.