House of Hohenstaufen in the context of "Growth of the Old Swiss Confederacy"

The Holy Roman Empire, also known as the Holy Roman Empire of the German Nation after 1512, was a polity in Central and Western Europe, usually headed by the Holy Roman Emperor. It developed in the Early Middle Ages (beginning in either 800 or 924), and lasted for a millennium until its dissolution in 1806 during the Napoleonic Wars. Initially, it comprised three constituent kingdoms—Germany, Italy, and, from 1032, Burgundy—held together by the emperor's overlordship. By the 15th century, imperial governance became concentrated in the Kingdom of Germany, as the empire's effective control over Italy and Burgundy had largely disappeared.

On 25 December 800, Pope Leo III crowned the Frankish king Charlemagne Roman emperor, reviving the title more than three centuries after the fall of the Western Roman Empire in 476. The title lapsed in 924, but was revived in 962 when Otto I was crowned emperor by Pope John XII, as Charlemagne's and the Carolingian Empire's successor. From 962 until the 12th century, the empire was one of the most powerful monarchies in Europe. It depended on cooperation between emperors and vassals; this was disturbed during the Salian period. The empire reached the apex of territorial expansion and power under the House of Hohenstaufen in the mid-13th century, but overextension led to a partial collapse. The imperial office was traditionally elective by the mostly German prince-electors. In theory and diplomacy, the emperors were considered the first among equals of all of Europe's Catholic monarchs.

The Old Swiss Confederacy began as a late medieval alliance between the communities of the valleys in the Central Alps, at the time part of the Holy Roman Empire, to facilitate the management of common interests such as free trade and to ensure the peace along the important trade routes through the mountains. The Hohenstaufen emperors had granted these valleys reichsfrei status in the early 13th century. As reichsfrei regions, the cantons (or regions) of Uri, Schwyz, and Unterwalden were under the direct authority of the emperor without any intermediate liege lords and thus were largely autonomous.

With the rise of the Habsburg dynasty, the kings and dukes of Habsburg sought to extend their influence over this region and to bring it under their rule; as a consequence, a conflict ensued between the Habsburgs and these mountain communities who tried to defend their privileged status as reichsfrei regions. The three founding cantons of the Schweizerische Eidgenossenschaft, as the confederacy was called, were joined in the early 14th century by the city states of Lucerne, Zürich, and Bern, and they managed to defeat Habsburg armies on several occasions. They also profited from the fact that the emperors of the Holy Roman Empire, for most of the 14th century, came from the House of Luxembourg and regarded them as potential useful allies against the rival Habsburgs.

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.

Swabia is a cultural, historic and linguistic region in southwestern Germany. The name is ultimately derived from the medieval Duchy of Swabia, one of the German stem duchies, representing the historic settlement area of the Germanic tribe alliances named Alemanni and Suebi.

This territory would include all of the Alemannic German area, but the modern concept of Swabia is more restricted, due to the collapse of the duchy of Swabia in the thirteenth century. Swabia as understood in modern ethnography roughly coincides with the Swabian Circle of the Holy Roman Empire as it stood during the early modern period, now divided between the states of Bavaria and Baden-Württemberg.

Conrad III (German: Konrad; Italian: Corrado; 1093 or 1094 – 15 February 1152) of the Hohenstaufen dynasty was from 1116 to 1120 Duke of Franconia, from 1127 to 1135 anti-king of his predecessor Lothair III, and from 1138 until his death in 1152 King of the Romans in the Holy Roman Empire. He was the son of Duke Frederick I of Swabia and Agnes, a daughter of Emperor Henry IV.

His reign saw the start of the conflicts between the Guelphs and Ghibellines. He was involved in the failed Second Crusade with Louis VII, where he would fight and lose at Doryleum and would later fall ill and return to Constantinople. After recuperating, he went to Jerusalem but would experience a string of failed sieges. Later returning from the Crusade, he was entangled in some conflicts with Welf VI's claim to the Duchy of Bavaria. On his deathbed, he designated his nephew Frederick Barbarossa as his successor instead of his son, Frederick IV, Duke of Swabia.

The Aachen Cathedral Treasury (German: Aachener Domschatzkammer) is a museum of the Roman Catholic Diocese of Aachen under the control of the cathedral chapter, which houses one of the most important collections of medieval church artworks in Europe. In 1978, the Aachen Cathedral Treasury, along with Aachen Cathedral, was the first monument on German soil to be entered in the List of UNESCO World Heritage Sites. The treasury contains works from Late Antique, Carolingian, Ottonian, Staufen, and Gothic times. The exhibits are displayed in premises connected to the cathedral cloisters.