Another challenge to Habsburg authority came from Germany and the question of either "big Germany" (united Germany led by Austria) or "little Germany" (united Germany led by Prussia). The Frankfurt National Assembly proposed a constitution with Friedrich Wilhelm of Prussia as monarch of a united federal Germany composed of only 'German' lands. This would have led to the relationship between Austria and Hungary (as a 'non-German' area) being reduced to a personal union under the Habsburgs, rather than a united state, an unacceptable arrangement for both the Habsburgs and Austro-German liberals in Austria.