Albrecht Theodor Emil Graf von Roon (; 30 April 1803 – 23 February 1879) was a Prussian soldier and statesman. As Minister of War from 1859 to 1873, Roon, along with Otto von Bismarck and Helmuth von Moltke, was a dominating figure in Prussia's government during the key decade of the 1860s, when a series of successful wars against Denmark, Austria, and France led to German unification under Prussia's leadership. A moderate conservative and supporter of executive monarchy, he was an avid modernizer who worked to improve the efficiency of the army.
Education
Roon was born at Pleushagen (now Pleśna), near Kolberg (now Kołobrzeg, Poland). His family was of Flemish origin and had settled in Pomerania. His father, an officer of the Prussian Army, died in poverty during the French occupation of the Kingdom of Prussia (see Napoleonic Wars), and the young Roon was brought up by his maternal grandmother.
Roon entered the corps of cadets at Kulm (now Chełmno, Poland) in 1816, from where he proceeded to the military school at Berlin in 1818, and in January 1821, he received a commission in the 14th (3rd Pomeranian) regiment quartered at Stargard in Pomerania. In 1824, he went through the three-year higher course of study at the General War School in Berlin (later called the Prussian Military Academy), where he improved his general education. Two years later, he was transferred to the 15th regiment at Minden. In 1832, Roon published the well-known Principles of Physical, National and Political Geography, in three volumes (Grundlage der Erd-, Völker- und Staaten-Kunde), which gained him a great reputation, and of which over 40,000 copies were sold in a few years. This work was followed in 1834 by Elements of Geography (Anfangsgrunde der Erdkunde), in 1837 by Military Geography of Europe (Militärische Landerbeschreibung von Europa), and in 1839 by The Iberian Peninsula (Die Iberische Halbinsel).
Roon, by contrast, believed that the Landwehr was both a politically and militarily false institution, limited in utility and lacking martial qualities. Roon's proposals for army reorganization met with strong opposition from the Prussian Landtag, which was dominated by the liberal German Progress Party, which wanted parliamentary control over the military budget. It took years of political fighting and the strong support of the new prime minister, Otto von Bismarck and Moltke, before Roon carried the day.
Roon also lengthened the compulsory military service to three years (four years for artillery and cavalry), and expanded the army to 200,000 men. These reforms were unpopular with the Prussian people and made Roon one of the most hated men in Prussia. However the reforms were supported by the King William I, and the chancellor Otto von Bismarck.
thumb|Roon, center, with [[Otto von Bismarck (left) and Helmuth Graf von Moltke (right). The three leaders of Prussia in the 1860s. Drawing with three cut-out heads.]]
National hero
thumb|German Headquarters in Versailles, Roon standing at right, painting by [[Anton von Werner, 1900]]
After the successful outcome of the Second Schleswig War of 1864, Roon went from being widely disliked in Prussia to a national hero in still-disunited Germany.
At the start of the Austro-Prussian War, Roon was promoted to General der Infanterie. He was present at the decisive victory at Königgrätz, under the command of Moltke. He received the Black Eagle at Nikolsburg on the road to Vienna. His army system was adopted after 1866 by the whole North German Confederation.
Bibliography
His son published Denkwürdigkeiten aus dem Leben des Generalfeldmarschalls Kriegsministers Grafen Roon (Memorable experiences from the life of General Field Marshal and Minister of War Count Roon) (2 vols., Breslau, 1892), and Kriegsminister von Roon als Redner politisch und militärisch erläutert (Minister of War Roon's Political and Military Speeches Examined) (Breslau, 1895). His correspondence with his friend Professor Cl. Perthes, 1864–67, was also published at Breslau in 1895.