The Holy Roman Empire at its greatest extent in the 13th century under the German Hohenstaufen dynasty (1155-1268).
The Staufer, aka House of Hohenstaufen, were a dynasty of German kings (1138–1254). They also ruled the Kingdom of Sicily. In Italy, they’re known as the Svevi (Swabians) as they were successive dukes of Swabia from 1079. Three members of the dynasty – Frederick I, Henry VI, and Frederick II – were crowned Holy Roman Emperors. The dynasty is named for their seat at Hohenstaufen Castle, which was in turn named for a conical hill of the Swabian Jura with the name Hohenstaufen in what is now Göppingen, Baden-Württemberg, Southwestern Germany. Read more: https://en.wikipedia.org/wiki/Hohenstaufen