The Cathedral of Christ, is a cathedral in Dublin and one of the main monuments of the Irish capital. It is the cathedral of the diocesianglicana of Dublin and Glendalough. The current structure of the cathedral dates back to 1870, but it has been replaced by a wooden one, much older, built by the will of the first Viking king Sigtrygg Barba di Seta, in 1038, after his conversion to Christianity. Destroyed by a fire, the church was rebuilt by the Normans during their rule, between 1173 and 1240. Later, the cathedral was left in ruins, but thanks to a long restoration of the nineteenth century, today it is observable as it was a time. Since 1993, in the cathedral wing known as the "synod hall" there is a museum (Dublinia) focusing on the Viking and medieval history of the city. The nave is the internal subdivision of a large building, both civil and religious, by means of a row of columns or pilastriseparati arcades or architraves. The naves were adopted in Greek and Roman architecture to divide covered buildings for public use, such as arcades, and civil basilicas. The great advantage of the aisles was that of dividing the internal space into several sections that were covered separately, thus without having to resort to domes and mammoth roofs in the case of very large buildings. In religious buildings the body of the aisles is usually inscribed in the so-called piedicroce. The churches in fact often had a Latin cross plan, where the body of the naves, which ran from the bottom of the building to the cruise with the transept, occupied the lower part of the cross precisely. Therefore, the piedicroce with the nave must not be confused. With the rise of Christianity and the abandonment of paganism by the Roman emperor Theodosius I, the already existing places of worship, namely the Roman and Greek temples, within which only the priest officiating the religious rites could access (the people in fact it remained outside of them), they did not prove suitable for the new cult, which had already been codified with the celebration of the Eucharist to be done indoors. Furthermore, Christians had a marked disregard for pagan religion, and the reuse of ancient temples as churches was very limited throughout Europe and the Mediterranean. Constantine I was the first to build new basilicas that were based on civilian basilicas, multi-purpose buildings dedicated to various commercial, forensic and political activities. The Christian basilicas, whose architecture was soon codified, had naves like the civil basilicas, from three to five. The central nave was higher, while the aisles were lower and narrower. The part of the central nave that emerged beyond the side aisles is called clerhistory, and was particularly important in the early Christian era because large windows were placed there that flooded the basilica with light. The shape of the naves also determined the profile of the façade, called "a capanna" because of the sloping slopes on the sides. Over the side aisles, matrons were often placed, that is the raised part of the church often reserved for women (but there are also "matronei" for the imperial court or other). Dublinia is a historical museum, located in a part of Christ Church Cathedral known as "synod hall" and centered on the Viking and medieval history of the city. There is an active historical re-enactment, with actors playing the part of Viking and medieval Dubliners (in costume), and encouraging visitors to participate. The exhibition opened in 1993, and was re-developed in 2010. The museum attracts over 125,000 visitors a year.