In 1084 the Song dynasty official Sima Guang completed the "Zizhi Tongjian" (Comprehensive Mirror to Aid in Government), which laid out the entire history of China from the beginning of the Warring States period (403 BCE) to the end of the Five Dynasties period (959 CE) in chronological annals form, rather than in the traditional annals-biography form. This work is considered much more accessible than the "Official Histories" for the Six dynasties, Tang dynasty, and Five Dynasties, and in practice superseded those works in the mind of the general reader.