Over a century later, the tutor of the "Analects" to Emperor Cheng of Han, Zhang Yu (d. 5 BC), synthesized the Lu and Qi versions by taking the Lu version as authoritative and selectively adding sections from the Qi version, and produced a composite text of the "Analects" known as the "Zhang Hou Lun". This text was recognized by Zhang Yu's contemporaries and by subsequent Han scholars as superior to either individual version, and is the text that is recognized as the "Analects" today. The Qi version was lost for about 1800 years but re-found during the excavation of the tomb of Marquis of Haihun in 2011. No complete copies of either the Lu version or the old text version of the "Analects" exist today, though fragments of the old text version were discovered at Dunhuang.