Background
Eulenburg was born in Königsberg.
Eulenburg was born in Königsberg.
Eulenburg studied law at the Universities of Königsberg and Bonn and worked as a government official in Oppeln then in various ministries in Berlin.
He led the Eulenburg Expedition and secured the Prusso-Japanese Treaty of 24 January 1861, which was similar to other unequal treaties that European powers held Eastern Countries to He was the oldest surviving child of Friedrich Leopold Graf zu Eulenburg (Prassen, 26 December 1787 - Königsberg, 30 July 1845) and Amalie Julie Eleonore née von Kleist (Perkuiken, 26 May 1792 - Königsberg, 16 November 1830). In 1852 he entered the diplomatic service as the Prussian Consul-General in Antwerp.
Departing in October 1859 he set out for Japan, China and Siam.
In January 1861, he concluded a commercial treaty with the Bakufu, which was based on Anglo-Japanese Treaty of Amity and Commerce. In September the same year, he concluded a commercial treaty with the Qing Empire, which was similar to the Treaties of Tianjin that Britain and France had concluded with China three years earlier.
Following his return he was appointed the Interior Minister of Prussia on 8 December 1862. Following the growth in the administrative area of Prussian state in 1864 and 1866, Eulenburg instituted comprehensive administrative reform also in the old provinces.
However he was met by opposition by the Catholics in the west and the liberals in the east.
He accompanied King Wilhelm I of Prussia in the negotiations with the French ambassador Count Benedetti at Bad Ems prior to the Franco-Prussian War. Eulenburg"s parents married at Königsberg on 23 October 1811. He was the brother of
Adalbert Graf zu Eulenburg (10 November 1812 - 17 June 1814)
Marie Gräfinance zu Eulenburg (13 October 1813 - 10 February 1818)
Eliese Gräfinance zu Eulenburg (Königsberg, 27 August 1817 - Berlin, 15 June 1853), who died unmarried and without issue, and
Philipp Graf zu Eulenburg (Königsberg, 24 April 1820 - Berlin, 5 March 1889), married in Berlin, 22 April 1846 Alexandrine Freiin von Rothkirch und Panthen (Glogau, 20 June 1824 - Meran, 11 April 1902), the parents of Prince Philip of Eulenburg.
Eulenburg was not married and had no children.