Along with pre-historic architecture, the first people in Italy to truly begin a sequence of designs were the Greeks and the Etruscans, progressing to classical Roman, then to the revival of the classical Roman era during the Renaissance and evolving into the Baroque era. The Christian concept of a Basilica, a style of church architecture that came to dominate the early Middle Ages, was invented in Rome. They were known for being long, rectangular buildings, which were built in an almost ancient Roman style, often rich in mosaics and decorations. The early Christians' art and architecture was also widely inspired by that of the pagan Romans; statues, mosaics and paintings decorated all their churches. The first significant buildings in the medieval Romanesque style were churches built in Italy during the 800s. Byzantine architecture was also widely diffused in Italy. The Byzantines kept Roman principles of architecture and art alive, and the most famous structure from this period is the Basilica of St. Mark in Venice.