In his book Zur Datierung des Königsfriedhofes von Ur (Rudolf Haibert Verlag Bonn, 1966) Nissen has re-examined the sequence dating of the Royal Cemetery of Ur and attempted to relate it to history. The archaeological analysis is necessarily based on the two great volumes written by the late Sir Leonard Woolley in 1934. This is not the first attempt of the kind, for another, unsuccessful one was made by Pallis many years ago. The fact is that the stratigraphic evidence of many critical points is defective and the major problems cannot be solved by using the internal evidence alone.

Nissen's new assessment of the situation depends largely on one important observation, namely: that Woolley made an error in the orientation of the Neo-Babylonian Temenos Wall which measures 103° on all plans except on pl. 274 where it is 98°. The discovery of this error has led Nissen to re-draw the cemetery plan with the wall aligned at the correct angle and to re-orientate many graves which during certain seasons Woolley specifically states were plotted with reference to that base line.