In the Sung dynasty, historians stressed the reflective value of history as a mirror for current times, such as the Yin Dynasty was reflected in the Xia or the Zhou was reflected in the Yin. Although the Sung chronologically followed on the period Five Dynasties, its historians looked back to the Tang for their mirror because the divisive struggles of the Five Dynasties were a result of the confusion at the end of the Tang, leading to its fall. Historians in the Northern Sung stressed the importance of Tang history, as can be seen from the extensive noting of affairs of Tang official in the Ce Fu Yuan Gui, compiled by government historians in the Zhen Cung period. It can also be see from the Spring and Autumn form of concealed criticism of Tang officials contained in the Ren Cung period New Tang History, compiled by Ou Yang Xiu, Sung Chi and others. In addition, the ”Tang Records” in the Ce Jhi Tung Jian by Si Ma Guang describes the Tang as a time of little government and much confusion. Similarly, Fan Zhu Yu in the Tang Jian evaluated the Tang situation of order coming from the employment of gentlemen as officials and confusion coming from the employment of minor people, seeing it as a lesson for his time. The Tang Shi Lun Duan of Sun Fu stressed moral values, saying that an emperor must observe strict self-cultivation, and that his indulgence in pleasures will bring confusion and downfall. In conclusion, although Sung historians' discussion of Tang history focused on issues of practical government, the most important aspect to their discussions was ideals and moral conduct.