The 1st Foot Guard Regiment () was an infantry regiment of the Royal Prussian Army formed in 1806 after Napoleon defeated Prussia in the Battle of Jena–Auerstedt. It was formed by combining all previous Foot Guard Regiments and was, from its inception, the bodyguard-regiment of Kings of Prussia. Save William II, who also wore the uniforms of other regiments, all Prussian Kings and most Princes of Prussia wore the uniform of the 1st Foot Guard Regiment. All Princes of Prussia were commissioned lieutenants in the 1st Foot Guards upon their tenth birthdays. The King of Prussia was also the Colonel-in-chief of the regiment, as well as the Chief of the 1st Battalion and 1st Company of the regiment. Therefore, the regiment held the highest rank within the Prussian Army, which, among other things, meant that the officer corps of the regiment marched before the princes of the German Empire and the diplomatic corps in the traditional New Year's reception. Unofficially, the regiment was known as the "First Regiment of Christendom" (). The regiment was disbanded in 1919 when the Imperial German Army was dissolved, with the Infantry Regiment 9 Potsdam of the new Reichsheer bearing its tradition. The Wachbataillon continues the tradition of this regiment in the Bundeswehr of the Federal Republic of Germany. Regimental commanders 4 November 1806 – 15 April 1807: Second Lieutenant Julius Ludwig von Pogwisch 16 April 1807 – 20 January 1813: Colonel Gustav Adolph von Kessel (died 18 September 1827 as lieutenant general) 9 February – 20 June 1813: Major Ernst Ludwig von Tippelskirch (died 23 January 1840 as lieutenant general) 20 June 1813 – 5 April 1814: Major Friedrich Johann Carl Gebhard von Alvensleben (died 12 February 1831 as lieutenant general) 7 April 1814 – 13 February 1816: Lt. Col Carl Heinrich von Block (died 18 January 1839 as general Commanding II. Army Corps) 13 February 1816 – 1 June 1828: Lt. Col Eugen Max von Röder (died 10 February 1844 as lieutenant general) 1 June 1828 – 20 September 1835: Colonel Carl Ludwig Wilhelm Ernst von Prittwitz (died 8 June 1871 as infantry general) 20 September 1835 – 25 March 1841: Col. Franz Karl von Werder (died 3 June 1869 as infantry general) 25 March 1841 – 27 March 1847: Col George Leopold Carl von Gayl II (died 29 November 1876 as general of the infantry) 27 March 1847 – 4 May 1850: