City of David Society/Drawing by Leen Ritmeyer

Author Cahill contends that the structure’s rib-and-spine walls substructure (highlighted in green) and the stepped-mantle superstructure (in orange) are a single architectural unit that dates to the transitional period between the Late Bronze Age and the Iron Age (13th-12th century B.C.E.), the time just prior to David’s capture of the city. It is proof, she argues, of Jerusalem’s significance at the time of David’s conquest and thereafter.