Erfurt Union
The Prussian king refused to accept the imperial crown in April. But immediately, he tried to unify Germany by himself with a project that was later called 'Erfurt Union'. Austria was not supposed to become part of this version of Lesser Germany. Joseph von Radowitz, adviser to the Prussian king and actual leader of the project, tried to bind Austria and the Union together in a confederation. Austria rejected these attempts and made Prussia give up its union plans in late 1850.