in Armenia in the early medieval period. The now-destroyed St. Theodore Church of Bagaran, dating from 624 to 631, was the only known church with a significantly similar plan and structure from that period. In the 19th century, during an architectural revival that looked back to Armenia's past, Etchmiadzin's plan was directly copied in new Armenian churches. Some notable examples from this period include the narthex of the St. Thaddeus Monastery in northern Iran, dating from 1811 or 1819 through 1830, and the Ghazanchetsots Cathedral in Shushi, dating from 1868. Its plan was also replicated in the Armenian diaspora, such as in the plans and designs of the Armenian Church, Singapore (1835) and the Armenian Church of Bucharest, Romania (1911–12). On European architecture Art historian Josef Strzygowski, who was the first European to thoroughly study Armenian architecture and place Armenia in the center of European architecture, suggested that several churches and chapels in Western Europe have been influenced by the cathedrals of Etchmiadzin and Bagaran due to similarities found within their plans. According to Strzygowski, some examples of churches influenced by Etchmiadzin and Bagaran are the 9th-century church of Germigny-des-Prés in France (built by Odo of Metz, probably an Armenian) and San Satiro of Milan, Italy. This view was later supported by Alexander Sahinian and Varazdat Harutyunyan. Sahinian suggested that Armenian church architecture was spread in Western Europe in the 8th–9th centuries by the Paulicians, who migrated from Armenia en mase after being suppressed by the Byzantines during the Iconoclasm period. Sahinian added many other medieval churches in Europe, such as the Palatine Chapel of Aachen in Germany, to the list of churches to have been influenced by the cathedrals of Etchmiadzin and Bagaran and by Byzantine decorative arts. According to Murad Hasratyan, Etchmiadzin's design was spread to Europe via the Eastern Roman Empire and served as a model—besides Germigny-des-Prés and San Satiro—for the Nea Ekklesia church in Constantinople and the churches of Mount Athos in Greece. Heritage designation In 2000 UNESCO added Etchmiadzin Cathedral, the churches of St. Hripsime, St. Gayane, Shoghakat and the ruined Zvartnots Cathedral to the list of World Heritage Sites. In 2002, the cathedral complex with over 50 monuments, including many khachkars (cross-stones) and graves located around the cathedral, was listed by the Government of Armenia in the list of historical and cultural monuments of the Armavir Province. Relics The museum of the cathedral has