Crown appears to be the earliest form of mitre crowns worn by the Holy Roman Emperors as a sign of their imperial office, the form of which was perpetuated in the crown created for Rudolf II and now known as the Imperial Crown of Austria. Commemoration An identical copy was made in 1915 by order of Wilhelm II for display in Aachen, where it is still kept in the Krönungssaal of Aachen Town Hall, built in the 14th century on the remains of Charlemagne's palace. There are also copies of the crown and regalia in the Historical Museum of Frankfurt; in the fortress of Trifels in the former Electorate of the Palatinate; and in the Czech castle of Karlštejn, along with a copy of the Crown of Saint Wenceslas. The Imperial Crown of the Holy Roman Empire was selected as the main motif for a high value commemorative coin, the €100 Imperial Crown of the Holy Roman Empire commemorative coin, minted in 2008. The obverse shows the Imperial Crown of the Holy Roman Empire. The reverse shows the Emperor Otto I with the Old St. Peter's Basilica in Rome in the background, where his coronation took place. See also Imperial crown Crown of Charlemagne Imperial Crown of Austria Imperial Crowns of Charles VII Crown of Napoleon Crown of Wilhelm II References Notes Bibliography Leithe-Jasper, Manfred (2005). The Kunsthistorisches Museum Vienna: The Imperial and Ecclesiastical Treasury. Scala Publisher. 10th-century sculptures Individual crowns Imperial Regalia of the Holy Roman Empire Ottonian sculptures Medieval crowns