Frederick III ( German: Friedrich Wilhelm Nikolaus Karl; 18 October 1831 – 15 June 1888), or Friedrich III, was German Emperor and King of Prussia for 99 days between March and June 1888, during the Year of the Three Emperors.
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Frederick (III), byname Frederick The Fair, German Friedrich Der Schöne, (born c. 1286—died Jan. 13, 1330, Gutenstein, Austria), German king from 1314 to 1326, also duke of Austria (as Frederick III) from 1308, the second son of the German king Albert I.
Frederick III, byname Frederick the Wise, German Friedrich der Weise, (born Jan. 17, 1463, Torgau, Saxony—died May 5, 1525, Lochau, near Torgau), elector of Saxony who worked for constitutional reform of the Holy Roman Empire and protected Martin Luther after Luther was placed under the imperial ban in 1521.
Frederick I, byname Frederick Barbarossa (Italian: Redbeard), (born c. 1123—died June 10, 1190), duke of Swabia (as Frederick III, 1147–90) and German king and Holy Roman emperor (1152–90), who challenged papal authority and sought to establish German predominance in western Europe.
Frederick III was King of Germany for more than five decades in the 15th Century and was also Holy Roman Emperor for nearly that long. His rule set the stage for the preeminence of the House of Habsburg. He was born on Sept. 21, 1415, in Innsbruck, Tyrol. His father was Ernest, Duke of Austria, and his mother was Cymburgis of Masovia.
Conrad III, (born 1093—died Feb. 15, 1152, Bamberg, Ger., Holy Roman Empire), German king from 1138 to 1152, the first king of the Hohenstaufen family. The son of Frederick I, duke of Swabia, and grandson of Emperor Henry IV, Conrad was appointed duke of Franconia by his uncle, Emperor Henry V, in 1115.
Count Frederick III (c. 1139 – c. 1200) accompanied Emperor Frederick Barbarossa against Henry the Lion in 1180, and through his marriage was granted the Burgraviate of Nuremberg by Emperor Henry VI in 1192. In about 1185, he married Sophia of Raabs, the daughter of Conrad II, Burgrave of Nuremberg. 
From left, on the podium (in black): Crown Prince Frederick (later Frederick III ), his father the emperor, and Frederick I of Baden, proposing a toast to the new emperor. At centre (in white): Otto von Bismarck, first Chancellor of Germany, Helmuth von Moltke the Elder, Prussian Chief of Staff.
William II, German Wilhelm II, in full Friedrich Wilhelm Viktor Albert, (born January 27, 1859, Potsdam, near Berlin [Germany]—died June 4, 1941, Doorn, Netherlands), German emperor (kaiser) and king of Prussia from 1888 to the end of World War I in 1918, known for his frequently militaristic manner as well as for his vacillating policies.
Born during the reign of his great-uncle Frederick William IV of Prussia, Wilhelm was the son of Prince Frederick William and Victoria, Princess Royal. Through his mother, he was the eldest grandchild of Queen Victoria of the United Kingdom. In March 1888, Wilhelm's father ascended the German and Prussian thrones as Frederick III.