List of German monarchs in 1918
Royal Standard: King of Prussia (1871–1918)
|Preceded by||Kingdom of Prussia|
|Followed by||Abolished 1918|
The term Kaiserreich or German Empire (Deutsches Kaiserreich) commonly refers to Germany, from its foundation as a unified nation-state on January 18, 1871, until the abdication of its last Kaiser, Wilhelm II, on November 9, 1918. Germans, when referring to the Reich in this period under the Kaisers, 1871 to 1918, typically use the term Kaiserreich. 
Federal prince (Bundesfürst) was the generic term for the royal heads of state (monarchs) of the various states making up the German Empire. The empire was a federal state, with its constituent states remaining sovereign states. In total, there were 22 federal princes of the German Empire and additionally three republican heads of state and the steward of the imperial territory ruled by Alsace-Lorraine. The states became part of the Kaiserreich by an 1871 treaty. The Kaiser as head of the empire was granted the title German Emperor (the style "Emperor of Germany" being deliberately avoided), and was simultaneously a federal prince as King of Prussia, the sovereign of its largest federal state. Of the princely heads of state, 4 held the title King (König) (the Kings of Prussia, Bavaria, Saxony, and Württemberg), 6 held the title Grand Duke (Großherzog), 5 held the title Duke (Herzog), and 7 held the title Prince (i.e. Sovereign Prince, Fürst).
Following the abdication of Wilhelm II on November 9, 1918 and German Revolution of 1918–19, the German nobility as a legally defined class was abolished on August 11, 1919 with the promulgation of the Weimar Constitution, under which all Germans were made equal before the law, and the legal rights and privileges, and all following German Houses, titles, insignia and ranks of nobility were abolished.
Emperor of Germany (1918)
|Emperor||Styles||Empress||Symbols||German Empire 1871 – 1918|
1859 – 1941
|His Imperial and Royal Majesty
The German Emperor, King of Prussia
Her Imperial and Royal Majesty
The German Empress, Queen of Prussia
1858 – 1921
|House of Hohenzollern
1871 – 1918
Prussia. Bavaria. Saxony. Württemberg.
Baden. Hesse. Mecklenburg-Schwerin. Mecklenburg-Strelitz. Oldenburg. Saxe-Weimar-Eisenach.
Anhalt. Brunswick. Saxe-Altenburg. Saxe-Coburg and Gotha. Saxe-Meiningen.
Lippe. Reuss, junior line. Reuss, senior line. Schaumburg-Lippe. Schwarzburg-Rudolstadt. Schwarzburg-Sondershausen. Waldeck-Pyrmont.
Free Hanseatic cities
Bremen. Hamburg. Lübeck.
Imperial territory (Reichsland)
Statement of Abdication (1918)
I herewith renounce for all time claims to the throne of Prussia and to the German Imperial throne connected therewith. At the same time I release all officials of the German Empire and of Prussia, as well as all officers, non-commissioned officers and men of the navy and of the Prussian army, as well as the troops of the federated states of Germany, from the oath of fidelity which they tendered to me as their Emperor, King and Commander-in-Chief. I expect of them that until the re-establishment of order in the German Empire they shall render assistance to those in actual power in Germany, in protecting the German people from the threatening dangers of anarchy, famine, and foreign rule. Proclaimed under our own hand and with the imperial seal attached. Amerongen, 28 November, 1918. Signed WILLIAM. 
Kings and Kingdoms (1918)
Grand Dukes and Grand Duchies (1918)
Dukes and Duchies (1918)
Princes and Principalities (1918)
|Ruler||Title||Arms – Flag||House – State||Location||Spouse – Children|
1871 – 1949
|House of Lippe
1123 – 1918
Principality of Lippe
1123 – 1918
(1) Princess Bertha of Hesse-Philippsthal-Barchfeld
(2) Princess Anna of Ysenburg and Büdingen
1883 – 1936
|House of Lippe
1123 – 1918
Principality of Schaumburg-Lippe
1643 – 1918
(1) Ellen Bischoff-Korthaus (1894–1936)
1852 – 1925
|House of Schwarzburg
11?? – 1918
Principality of Schwarzburg-Rudolstadt
1599 – 1919
Principality of Schwarzburg-Sondershausen
(1) Princess Anna Louise of Schönburg-Waldenburg