Please answer the following question: Information: - A castle (from ) is a type of fortified structure built in Europe and the Middle East during the Middle Ages by nobility. Scholars debate the scope of the word "castle", but usually consider it to be the private fortified residence of a lord or noble. This is distinct from a palace, which is not fortified; from a fortress, which was not always a residence for nobility; and from a fortified settlement, which was a public defence though there are many similarities among these types of construction. Usage of the term has varied over time and has been applied to structures as diverse as hill forts and country houses. Over the approximately 900years that castles were built, they took on a great many forms with many different features, although some, such as curtain walls and arrowslits, were commonplace. - The Early Middle Ages (or early medieval period) marked the start of the Middle Ages of European History, lasting from the 6th to the 10th century C.E. The Early Middle Ages followed the decline of the Western Roman Empire and preceded the High Middle Ages (c. 10th to 13th centuries). The Early Middle Ages largely overlap with Late Ant1iquity. The term "Late Antiquity" is used to emphasize elements of continuity with the Roman Empire, while "Early Middle Ages" is used to emphasize developments characteristic of the later medieval period. - Luneburg (officially the "Hanseatic Town of Luneburg", German: "Hansestadt Luneburg", , Low German "Lumborg", Latin "Luneburgum" or "Lunaburgum", Old High German "Luneburc", Old Saxon "Hliuni", Polabian "Glain"), also called Lunenburg in English, is a town in the German state of Lower Saxony. It is located about southeast of another Hanseatic city, Hamburg. It is part of the Hamburg Metropolitan Region. The capital of the district of Luneburg, its population is around 72,000 people. Luneburg's urban area, which includes the surrounding communities like Adendorf, Bardowick, Bleckede, Amelinghausen and Reppenstedt, has a population of around 103,000. Luneburg has been allowed to use the title "Hansestadt" ("Hanseatic Town") in its name since 2007, in recognition of its membership in the former Hanseatic League. Luneburg is also a university town. - Lower Saxony is a German state ("Bundesland") situated in northwestern Germany and is second in area, with , and fourth in population (8 million) among the sixteen "Lander" of Germany. In rural areas Northern Low Saxon, a dialect of Low German, and Saterland Frisian, a variety of Frisian, are still spoken, but the number of speakers is declining. - The circular rampart of Burg ( German : Ringwall von Burg ) is a defensive work from the Early Middle Ages period located near the German town of Celle in Lower Saxony . The site , dating roughly to the 10th century and located in an inaccessible area of marsh by the River Fuhse , probably acted as a refuge for the local population . Today this 3 metre high circular embankment belongs to one of the most important Early Middle Age historical monuments in Celle . - The German Timber-Frame Road (German: Deutsche Fachwerkstrae) is a German tourist route leading from the river Elbe in the north to Lake Constance in the south. Along this road are numerous cities and towns each with examples of the vernacular timber-framed houses traditional to the German states. The route is divided into seven sections, each of which follow the traditional areas of: Lower Saxony, Saxony-Anhalt, Hesse, Thuringia, Bavaria and Baden-Wurttemberg. The total length is nearly . History. In 1975 the 'ARGE Historische Fachwerkstadte e.V.' (Association of Historic Timber-Framed Towns) was founded. Its aim is to preserve the cultural heritage of a huge variety of different styles of half-timbering in Germany. To share this knowledge with other interested people the 'German Timber-Frame Road' (sometimes referred to as the "German Timber-Frame Route") was founded in 1990. In the meantime 98 timber-framed towns have joined up under the slogan "Timber-framed houses unite". - In historiography, the Western Roman Empire consists of the western provinces of the Roman Empire at any one time during which they were administered by a separate independent Imperial court, coequal with (or only nominally subordinate to) that administering the eastern half. Both "Western Roman Empire" and "Eastern Roman Empire" (or "Byzantine Empire") are modern terms describing "de facto" independent entities; however, at no point did Romans consider the Empire split into two, but rather considered it a single state governed by two separate Imperial courts out of administrative expediency. The view that the Empire was impossible to govern by one emperor was established by Diocletian following the disastrous civil wars and disintegration of the Crisis of the 3rd century, and was instituted in Roman law by his introduction of the Tetrarchy in AD 285, a form of government which was legally to endure in one form or another for centuries. The Western Court was periodically abolished and recreated for the next two centuries until final abolition by the Emperor Zeno in 480, by which time there was little effective central control left in the area legally administered by the Western Court. - The Baroque (or ) is often thought of as a period of artistic style that used exaggerated motion and clear, easily interpreted detail to produce drama, tension, exuberance, and grandeur in sculpture, painting, architecture, literature, dance, theater, and music. The style began around 1600 in Rome and Italy, and spread to most of Europe. - The Roman Empire (Koine and Medieval Greek: , tr. ) was the post-Roman Republic period of the ancient Roman civilization, characterized by government headed by emperors and large territorial holdings around the Mediterranean Sea in Europe, Africa and Asia. The city of Rome was the largest city in the world BC AD, with Constantinople (New Rome) becoming the largest around 500 AD, and the Empire's populace grew to an estimated 50 to 90million inhabitants (roughly 20% of the world's population at the time). The 500-year-old republic which preceded it was severely destabilized in a series of civil wars and political conflict, during which Julius Caesar was appointed as perpetual dictator and then assassinated in 44 BC. Civil wars and executions continued, culminating in the victory of Octavian, Caesar's adopted son, over Mark Antony and Cleopatra at the Battle of Actium in 31 BC and the annexation of Egypt. Octavian's power was then unassailable and in 27 BC the Roman Senate formally granted him overarching power and the new title "Augustus", effectively marking the end of the Roman Republic. - Celle is a town and capital of the district of Celle, in Lower Saxony, Germany. The town is situated on the banks of the River Aller, a tributary of the Weser and has a population of about 71,000. Celle is the southern gateway to the Luneburg Heath, has a castle ("Schloss Celle") built in the renaissance and baroque style and a picturesque old town centre (the "Altstadt") with over 400 timber-framed houses, making Celle one of the most remarkable members of the German Timber-Frame Road. From 1378 to 1705, Celle was the official residence of the Luneburg branch of the dukes of Brunswick-Luneburg (House of Welf) who had been banished from their original ducal seat by its townsfolk. - The High Middle Ages or High Medieval Period was the period of European history around the 11th, 12th, and 13th centuries (c. 10011300). The High Middle Ages were preceded by the Early Middle Ages and followed by the Late Middle Ages, which by convention end around 1500. - Germany, officially the Federal Republic of Germany, is a federal parliamentary republic in central-western Europe. It includes 16 constituent states, covers an area of , and has a largely temperate seasonal climate. With about 82 million inhabitants, Germany is the most populous member state of the European Union. After the United States, it is the second most popular immigration destination in the world. Germany's capital and largest metropolis is Berlin. Other major cities include Hamburg, Munich, Cologne, Frankfurt, Stuttgart and Dusseldorf. Given the paragraphs above, decide what entity has the relation 'inception' with '900'.
Answer:
circular rampart of burg