Sun Tzu proved on the battlefield that his theories were effective (for example, at the Battle of Boju), that he had a successful military career, and that he wrote "The Art of War" based on his tested expertise. However, the "Zuozhuan", a historical text written centuries earlier than the "Shiji", provides a much more detailed account of the Battle of Boju, but does not mention Sun Tzu at all. Beginning around the 12th century, some scholars began to doubt the historical existence of Sun Tzu, primarily on the grounds that he is not mentioned in the historical classic "Zuo zhuan", which mentions
Development of the New Testament canon attributed to the "Decretum Gelasianum" gives a list identical to what would be the Canon of Trent, and, though the text may in fact not be Damasian, it is at least a valuable 6th century compilation. This list, given below, was purportedly endorsed by Pope Damasus I: The so-called "Decretum Gelasianum de libris recipiendis et non recipiendis", is traditionally attributed to Pope Gelasius I, bishop of Rome 492–496 AD. However, upon the whole it is probably of South Gallic origin (6th century), but several parts can be traced back to Pope Damasus and reflect Roman tradition. The 2nd part is