In 1981, Speyer Cathedral was inscribed on the UNESCO World Heritage List as the masterwork of Romanesque architecture in Germany. Consecrated to the Virgin Mary and Saint Stephen, the cathedral was constructed in two long phases, between 1025 and 1061 and between 1082 and 1106. It perfects a floor plan which was to have a great influence on the development of Romanesque architecture in the 11th and 12th centuries. The floor plan’s hallmarks are the balanced division of the building into East and West, and the symmetrical arrangement of four towers at the corners of the space created by the nave and transept.