Henry VI, Holy Roman Emperor in the context of "Mainz-Kostheim"

Frederick II (Italian: Federico, Sicilian: Fidiricu, German: Friedrich, Latin: Fridericus; 26 December 1194 – 13 December 1250) was King of Sicily from 1198, King of Germany from 1212, King of Italy and Holy Roman Emperor from 1220 and King of Jerusalem from 1225. He was the son of Emperor Henry VI of the Hohenstaufen dynasty (the second son of Emperor Frederick Barbarossa) and Queen Constance I of Sicily of the Hauteville dynasty.

Frederick was one of the most brilliant and powerful figures of the Middle Ages and ruled a vast area, beginning with Sicily and stretching through Italy all the way north to Germany. Viewing himself as a direct successor to the Roman emperors of antiquity, he was Emperor of the Romans from his papal coronation in 1220 until his death; he was also a claimant to the title of King of the Romans from 1212 and unopposed holder of that monarchy from 1215. As such, he was King of Germany, of Italy, and of Burgundy. At the age of three, he was crowned King of Sicily as co-ruler with his mother, Constance, Queen of Sicily, the daughter of Roger II of Sicily. His other royal title was King of Jerusalem by virtue of marriage and his connection with the Sixth Crusade. Frequently at war with the papacy, which was hemmed in between Frederick's lands in northern Italy and his Kingdom of Sicily (the Regno) to the south, he was "excommunicated four times between 1227 and his own death in 1250", and was often vilified in pro-papal chronicles of the time and after. Pope Innocent IV went so far as to declare him preambulus Antichristi (forerunner of the Antichrist).

The Hohenstaufen dynasty (/ˈhoʊənʃtaʊfən/, US also /-staʊ-/, German: [ˌhoːənˈʃtaʊfn̩]), also known as the Staufer, was a noble family of German origin that rose to rule the Duchy of Swabia from 1079, and to royal rule in the Holy Roman Empire during the Middle Ages from 1138 until 1254. The dynasty's most prominent rulers – Frederick I (1155), Henry VI (1191) and Frederick II (1220) – ascended the imperial throne and also reigned over Italy and Burgundy. The non-contemporary name of 'Hohenstaufen' is derived from the family's Hohenstaufen Castle on Hohenstaufen mountain at the northern fringes of the Swabian Jura, near the town of Göppingen. Under Hohenstaufen rule, the Holy Roman Empire reached its greatest territorial extent from 1155 to 1268.

Philip of Swabia (February/March 1177 – 21 June 1208), styled Philip II in his charters, was a member of the House of Hohenstaufen and King of Germany from 1198 until his assassination.

The death of Philip's older brother Henry VI, Holy Roman Emperor, in 1197 meant that the Hohenstaufen rule (which reached as far as the Kingdom of Sicily) collapsed in imperial Italy and created a power vacuum to the north of the Alps. Reservations about the kingship of Henry's underage son, Frederick, led to two royal elections in 1198, which resulted in the German throne dispute: the two elected kings, Philip of Swabia and Otto of Brunswick, claimed the throne for themselves. Both opponents tried in the following years through European and papal support, with the help of money and gifts, through demonstrative public appearances and rituals, to decide the conflict for oneself by raising ranks or by military and diplomatic measures. Philip was able to increasingly assert his kingship against Otto in the north part of the Alps. However, at the height of his power, he was assassinated in 1208. This ended the dispute for the throne; his opponent Otto quickly found recognition. Philip was the first German king to be murdered during his reign. In posterity, Philip is one of the little-noticed Hohenstaufen rulers.

German nationalism (German: Deutscher Nationalismus) is an ideological notion that promotes the unity of Germans and of the Germanosphere into one unified nation-state. It emphasises and takes pride in the patriotism and national identity of Germans as one nation and one people. German nationalism, and the concept of nationalism itself, began during the late 18th century, which later gave rise to Pan-Germanism. Advocacy of a German nation-state became an important political force in response to the invasion of German territories by France under Napoleon Bonaparte. In the 19th century, Germans debated the German question over whether the German nation-state should comprise a "Lesser Germany" that excluded the Austrian Empire or a "Greater Germany" that included the Austrian Empire or its German speaking part. The faction led by Prussian Chancellor Otto von Bismarck succeeded in forging a Lesser Germany.

Aggressive German nationalism and territorial expansion were key factors leading to both World Wars. Before World War I, Germany had established a colonial empire, which became the third-largest, after Britain and France. In the 1930s, the Nazis came to power and sought to unify all ethnic Germans under the leadership of Adolf Hitler, eventually leading to the extermination of Jews, Poles, Romani, and other people deemed Untermenschen (subhumans) in the Holocaust during World War II. After the defeat of Nazi Germany, the country was divided into East and West Germany in the opening acts of the Cold War, and each state retained a sense of German identity and held reunification as a goal, albeit in different contexts. The creation of the European Union was in part an effort to harness German identity to a European identity. West Germany underwent its economic miracle following the war which led to the creation of a guest worker program; many of these workers settled in Germany which led to tensions around questions of national and cultural identity, especially with regard to Turks who settled in Germany.

The soldo was an Italian silver coin, issued for the first time in the late 12th century at Milan by Emperor Henry VI. The name derives from the late Roman coin solidus.