The Erfurt Union Parliament (Erfurter Union Parliament), lasting from March 20 to April 29, 1850, was opened at the former Augustinian monastery at Erfurt. The union never came into effect, and was completely undermined by the Punctuation of Olmütz, a treaty between Prussia and Austria, signed 29 November 1850, by which Prussia abandoned the Erfurt Union and accepted the revival of the German Confederation under Austrian leadership.[2][3] 1861–62: King Wilhelm I became King of Prussia and he appointed Otto von Bismarck on 23 September 1862, Minister President and Foreign Minister, who favoured a 'blood-and-iron' policy to create a united Germany under the leadership of Prussia. 1864: The Danish-Prussian War started as Prussia protested against Danish incorporation of Schleswig into the Kingdom of Denmark.