states the existence of a bronze eagle, the exact location of which is unknown: In 881, a Viking raid damaged the palace and the chapel. In 1000, the Holy Roman Emperor Otto III had Charlemagne's tomb opened. According to two 11th-century chroniclers, he would have been found sitting on his throne, wearing his crown and holding his sceptre. However, Eginhard does not mention this in his biography of the Emperor. At the same time the veneration of Charlemagne began to attract pilgrims to the chapel. In the 12th century, Frederick Barbarossa placed the body of the Carolingian Emperor into a reliquary and interceded with the Pope for his canonization; the relics were scattered across the empire. The treasure of Aachen began to grow with numerous gifts from French and German kings and princes. Between 1355 and 1414, an apse was added to the east end of the chapel. The City Hall was built from 1267 on the site of the Council Hall. During the French Revolution, the French occupied Aachen and looted its treasure. Before choosing Notre-Dame de Paris, Napoleon I had considered for a time holding his Imperial Coronation in Aachen. The chapel was restored in 1884. In 1978 the cathedral, including the chapel, was listed as a World Heritage Site by UNESCO. See also Aachen Carolingian art Carolingian Empire Palatine Chapel in Aachen Notes References Alain Erlande-Brandeburg, Anne-Bénédicte Erlande-Brandeburg, Histoire de l’architecture française, tome 1 : du Moyen Âge à la Renaissance, IVe – XVIe siècle, 1999, Paris, éditions du Patrimoine, . Gabrielle Démians D’Archimbaud, Histoire artistique de l’Occident médiéval, Paris, Colin, 3e édition, 1968, 1992, . Marcel Durliat, Des barbares à l’an Mil, Paris, éditions citadelles et Mazenod, 1985, . Jean Favier, Charlemagne, Paris, Fayard, 1999, . Jean Hubert, Jean Porcher, W. F. Volbach, L’empire carolingien, Paris, Gallimard, 1968 Félix Kreush, « La Chapelle palatine de Charlemagne à Aix », dans Les Dossiers d'archéologie, n°30, 1978, pages 14–23. Pierre Riché, La Vie quotidienne dans l’Empire carolingien, Paris, Hachette, 1973 Pierre Riché, Les Carolingiens. Une famille qui fit l’Europe, Paris, Hachette, 1983, . External links Aachen cathedral in pictures Buildings and structures completed in the 8th century Palaces in North Rhine-Westphalia Carolingian architecture Charlemagne Aachen Landmarks in Germany History of Aachen Aachen Articles containing video clips