-The Ottonian Renaissance is a period of time in the Middle Ages that is named after the Ottonian dynasty. -During the Ottonian Renaissance, there was a revival of classical art and culture. -Some famous examples of Ottonian architecture are the cathedrals of Cologne and Aachen. -The characteristic of Ottonian architecture is its use of Romanesque elements, such as arches and vaults, with Byzantine elements, such as mosaics and frescoes. -The most famous Ottonian architect was Gerbert of Aurillac, who later became Pope Sylvester II. -The difference between Romanesque and Ottonian architecture is that Romanesque architecture is more simple and Ottonian architecture is more ornate.