In 1971, a plan for preserving the ancient street was submitted by architects Peter Bogod, Esther Krendel and Shlomo Aronson. Their proposal relied heavily on the sixth century Madaba map, a mosaic map of Jerusalem found in 1897 in Madaba, Jordan. The map clearly showed the Roman Cardo as the main artery through the Old City. The architects proposed a covered shopping arcade that would preserve the style of an ancient Roman street using contemporary materials. Their plan was based on the hope that archeologists would find remains of the southern end of the Cardo, an extension of the north-south Roman thoroughfare built during the Byzantine era (324–638).